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AEM (30-4110) UEGO Air/Fuel Ratio Gauge

4.0 4.0 out of 5 stars 2,509 ratings
$184.95
Available at a lower price from other sellers that may not offer free Prime shipping.
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Purchase options and add-ons

Brand AEM
Material Plastic
Item dimensions L x W x H 2.17 x 2.76 x 2.17 inches
Item Weight 400 Grams

About this item

  • Interchangeable black and white faceplates included for customizing gauge appearance.Material:Plastic
  • Bosch 4.9 LSU wideband sensor and weld-in bung included PN 30-4110
  • No free air sensor calibration required ever. A 2-1/16 inch gauge housing ensures that it will fit in most gauge pods and can be remotely mounted virtually anywhere
  • Interchangeable black and silver bezels included. 52mm (2-1/16”) gauge housing
  • 0-5V analog output 10-20 AFR range only
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.17 x 2.76 x 2.17 inches; 14.11 ounces
  • Item model number ‏ : ‎ 30-4110
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ August 21, 2014
  • Manufacturer ‏ : ‎ AEM
  • ASIN ‏ : ‎ B00N3VGPYS
  • Customer Reviews:
    4.0 4.0 out of 5 stars 2,509 ratings

Product Description

Our World-famous Wideband O2 air/fuel ratio UEGO gauge features a digital LED display and sweeping LED 'needle' that changes colors as AFR changes from rich to lean. A 52mm (2-1/16") gauge housing ensures that it will fit in most gauge pods and can be remotely mounted virtually anywhere. All AEM digital gauges feature a 0-5V analog output for use with data loggers and almost any engine management system. Each gauge comes with black and silver bezels and black and white faceplates for multiple color combinations and a custom look (a black Lambda faceplate and black and white Air/Fuel Ratio faceplates). The Bosch UEGO sensor gives the controller its speed and accuracy. The Bosch 4.9 LSU sensor used in the AEM Wideband UEGO AFR Controller Gauge has a faster light off time and draws less current than the 4.2 LSU sensor used with AEM's 30-4100 Wideband UEGO Controller Gauge, which will be superseded to the gauge in August, 2014. The 4.9 LSU sensor features the same fuel compatibility as the 4.2 LSU and NEVER requires free-air calibration when used with AEM's Wideband UEGO AFR Gauge. The 4.9 LSU sensor uses a different connector than the connector used with the 4.2 LSU sensors included with the original 30-4100 gauge controller. The sensors are not interchangeable between the two gauge controllers in any way, including changing connectors on the gauges. The Wideband O2 air/fuel ratio UEGO gauge is a must if you want to maximize your engine's power and safety. When tuning an engine, accurate air/fuel ratio data is critical because running with too rich of an AFR can cause a loss of power, and running a lean AFR can result in serious engine damage. AEM's digital Wideband AFR UEGO gauge can quickly alert you to even a .1 change in air/fuel ratio and provide enough time to shut down an engine before damage occurs. There are two harnesses that connect to the back of the AEM UEGO gauge. The longer harness connects to the UEGO sensor. The shorter harness contains four leads.

Top Brand: AEM

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What's in the box

  • Gauge

    • Product guides and documents

    Installation Manual (PDF)

    Looking for specific info?

    Customer reviews

    4 out of 5 stars
    4 out of 5
    2,509 global ratings

    Customers say

    Customers like the quality and ease of installation of the electromechanical gauge. They mention that the bung is well made and easy to weld into the pipe. Customers are also satisfied with the accuracy. However, some customers have reported issues with the sensor, saying that it was defective. Customers also are disappointed with leanness. Customers disagree on performance, readability, and value.

    AI-generated from the text of customer reviews

    206 customers mention155 positive51 negative

    Customers like the quality of the electromechanical gauge. They say it's a high-quality product, with a simple installation. Customers are also satisfied with the quality and performance, saying the readings are instant. The bung is well-made and easy to weld into the pipe. Overall, customers describe it as a great product and reliable.

    "Seems to be accurate and well built" Read more

    "Looks like it is built pretty decent, though the case is a very cheap plastic and would of preferred metal but seems everything is plastic nowadays...." Read more

    "Gauge is straight forward and is as advertised...." Read more

    "...It's not emulated well at all actually just makes my miata (1994 1.8L) run deathly lean, almost like the stock ecu isn't reading the signal..." Read more

    101 customers mention101 positive0 negative

    Customers find the installation of the electromechanical gauge simple and straight forward. They say the instructions are extremely simple. They also mention that the bung is well made and easy to weld into the pipe. Overall, customers are satisfied with the ease of installation and performance of the product.

    "...All-in-all, the installation process was easy, the kit came with two different color choices (black or silver), and helping identify a problem that..." Read more

    "It works and it preforms very well, it's very responsive to sudden changes...." Read more

    "Title says all. Install is easy, wired through cigarette lighter...." Read more

    "Was easy enough to hook up. Not using all of the features. Just using to help dial in carb settings.Sensor failed after the first tank of gas...." Read more

    42 customers mention33 positive9 negative

    Customers like the accuracy of the gauge. They mention that it reads fairly accurate for expected values, and never has calibration issues. Some say that the gauge is authentic and seems to be accurate.

    "Seems to be accurate and well built" Read more

    "Very accurate. Easy to install ~45 minutes total for me but i do these kinds of builds all the time...." Read more

    "...It's very accurate compared to my HP tuners piggyback 02 wideband clip on and very easy to read...." Read more

    "impossible to get an accurate calibration from the gauge to my ecu,0.0v = 10.004.9v = 19.98wrong...." Read more

    212 customers mention133 positive79 negative

    Customers are mixed about the performance of the gauge. Some mention that it works well, while others say that it never worked right. The sensor that came with the product failed after only a few weeks, and some customers have reported issues with the LEDs not working.

    "...It worked and works very well. It does have quite the light show when you first start the car as it boots itself up...." Read more

    "...a mistake, the wiring was cheap, the connector was junk, it didn't work right off the start, and was broken after a week...." Read more

    "This gauge is a must need for sure works amazingly" Read more

    "...Gauge works well, I have yet to hook up to my data loggers for my tuner to data log the analog output...." Read more

    57 customers mention19 positive38 negative

    Customers are mixed about the readability of the gauge. Some mention it's easy to read and accurate at idle, while others say that the reading is all over the place and won't read properly.

    "...Unfortunately after 4000 miles the sensor again has died and reads full lean, it also fails the brake clean test miserably with no response even..." Read more

    "...The LED numbers are very easy to read and show up nicely under any lighting conditions...." Read more

    "...Don't know how or why but after a 5 minute drive sensor began to read leaner and leaner until it hit full lean "- - -" even though car is not..." Read more

    "Liked the price. Used on turbo car but didn't read well at all." Read more

    55 customers mention37 positive18 negative

    Customers are mixed about the value of the gauge. Some mention that it's the best inexpensive wide band on the market, while others say that it isn't worth the money. They also say that the sensor is poorly made and expensive.

    "...This much value for 150 dollars is amazing compared to what you got for your money 15-20 years ago...." Read more

    "Liked the price. Used on turbo car but didn't read well at all." Read more

    "Looks like it is built pretty decent, though the case is a very cheap plastic and would of preferred metal but seems everything is plastic nowadays...." Read more

    "...who got this guage is to get a quality Bosch o2 sensor, the guage is worth the money but its sensor is, well, crap" Read more

    202 customers mention6 positive196 negative

    Customers are dissatisfied with the sensor. They mention that it's defective, and the quality is very poor. Some customers also say that the sensor failed not even 48 hours after installation.

    "...But after testing and checking my MAP sensor I found that my MAP sensor was bad and that if was causing my car to run super lean...." Read more

    "...After a few months and one return/replacement later because of a faulty bosch sensor and some weird troubleshooting, it's had no issues since and I..." Read more

    "02 sensor lasted 20 minutes then went to full lean. 3 dash on screen. If course it's only part not covered under warranty by aem...." Read more

    "...Suspect faulty gauge or sensor but I am awaiting response from AEM...." Read more

    26 customers mention0 positive26 negative

    Customers are dissatisfied with the leanness of the gauge. They mention that it keeps going lean even when their car is running rich. Some customers also report that the gauge immediately pegs max lean and wouldn't move.

    "...not emulated well at all actually just makes my miata (1994 1.8L) run deathly lean, almost like the stock ecu isn't reading the signal correctly..." Read more

    "02 sensor lasted 20 minutes then went to full lean. 3 dash on screen. If course it's only part not covered under warranty by aem...." Read more

    "So I got it installed, it ran but it kept going full lean when I knew my tune was super rich, then eventually I sent the gauge in and finished up..." Read more

    "...Stuck at full lean - - - . I know I’m not lean. The whole reason for the gauge was to lean it down because of the overly rich jets...." Read more

    Good but there IS a fixable issue
    3 Stars
    Good but there IS a fixable issue
    Well here's the BAD, IT SAYS it comes with a Bosch oxygen sensor. Well that's NOT true. It's a Chinese knock off that honestly lasted 10 minutes or less... TWICE ( I returned they 1st gauge kit and I got another 2 days later that lasted 5 minutes).The FIX. after the 2nd o2 sensor didn't work with either of the gauges ( from the 1st or 2nd kit) . I ordered the BOSCH o2 sensor that SHOULD have come with it . Picture is of the o2 sensor part number you will need.It has been working great now, no issues and it REALLY makes carb tuning much easier. You can see a difference in readings with each 1/4 turn of mixture screws.It's nice to not only feel the difference as you tune it but actually be able to see the difference on this guage as you change jets, needles and springs.Loving it..With that AEM SHAME ON YOU for putting a JUNK o2 sensor in this kit and try to say it's Bosch.
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    Top reviews from the United States

    Jwhit
    5.0 out of 5 stars Thought I had a bad O2 sensor but...
    Reviewed in the United States on January 5, 2024
    Style: CustomVerified Purchase
    So I bought this UEGO AFR gauge to allow me to monitor my Air/Fuel ratio in my EVO X because I upgraded my fuel system. After installation, which was pretty easy thanks to YouTube videos, my AFR gauge would start off at 14.7 (which is normal) but then max out and go to ***. I checked only line about what this issue was and a lot of things I found was that people would receive bad O2 sensors with their kits and I was afraid that is what happened to me. But after testing and checking my MAP sensor I found that my MAP sensor was bad and that if was causing my car to run super lean. After replacing the MAP sensor the AFR gauge started working properly which made me very happy. All-in-all, the installation process was easy, the kit came with two different color choices (black or silver), and helping identify a problem that my ECU wasn't reporting made this purchase one of the best decisions I have made lately. I would purchase again if need be.
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    sarge
    5.0 out of 5 stars Pricey but top notch
    Reviewed in the United States on April 7, 2024
    Style: CustomVerified Purchase
    Seems to be accurate and well built
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    Mr_MagicMan
    1.0 out of 5 stars You'll get maybe 6 months but probably not.
    Reviewed in the United States on April 1, 2023
    Style: CustomVerified Purchase
    It works and it preforms very well, it's very responsive to sudden changes. A lot of the instillation and preformance depends on the vehicle but the power wiring pigtail could be another foot longer and the sensor lead itself is plenty long for my installation.
    You will need to know basic wiring and have a second bung welded into your exhaust in the correct spot. The "P4" setting is terrible, do not buy it for this purpose. It's not emulated well at all actually just makes my miata (1994 1.8L) run deathly lean, almost like the stock ecu isn't reading the signal correctly (wiring was verified through factory wiring diagrams). I ended up buying a new narrowband and welding in the provided bung after already cutting into the wiring.
    The setting switch is deeply recessed into the device and the retention tab actually blocks access to it. The two wiring pigtail connections and placed too close and the cutout for them is not big enough, they both just barely fit in and you have to wiggle with it a little to even get both to get into place. It works as it is but it's not ideal.
    After a few months and one return/replacement later because of a faulty bosch sensor and some weird troubleshooting, it's had no issues since and I've placed about 2500 miles on it with quick readings, and no sun glare even with the top down and shining on it.
    Update 12/10: I have since moved to standalone and don’t need the narrowband emulation feature anymore. Unfortunately after 4000 miles the sensor again has died and reads full lean, it also fails the brake clean test miserably with no response even when soaked. Will be contacting seller for a potential replacement sensor.
    3 people found this helpful
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    Brandon Tchida
    5.0 out of 5 stars Great affordable A/F gauge.
    Reviewed in the United States on September 2, 2015
    Style: CustomVerified Purchase
    Before I bought this gauge, I tried to save some money by purchasing a cheap eBay APSX wideband. That was a mistake, the wiring was cheap, the connector was junk, it didn't work right off the start, and was broken after a week.

    This gauge is phenomenal. The wiring is all thicker gauge (I think 18?) which was bigger than the cheap one I got.
    The sweeping LEDs work great and look very smooth while driving.
    The LED numbers are very easy to read and show up nicely under any lighting conditions.
    The ONLY complaint I have is that when you are off the throttle and the A/F ratio is 19 or so, it just reads "--" and I wish it would say 19. It's not an issue of any kind and it doesn't do it any other time than when you see coasting off the throttle.

    Overall this is a great gauge and I would absolutely reccomenend spending the extra 30$ to but this instead of the cheap eBay one.
    3 people found this helpful
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    Raceline Central
    5.0 out of 5 stars AEM (30-4110) UEGO Air/Fuel Ratio Gauge ...
    Reviewed in the United States on August 15, 2015
    Style: CustomVerified Purchase
    Looks like it is built pretty decent, though the case is a very cheap plastic and would of preferred metal but seems everything is plastic nowadays. I installed it and the sensor screwed right into my existing bung. The threads are precoated with I think is anti-seize. The sensor cable is plenty long enough for my application and I probably will end up with a glove box full of rolled up cable. Once I get it running, I will try to update my review here.

    UPDATE:
    After installing the gauge and sensor, I am impressed with the product. It worked and works very well. It does have quite the light show when you first start the car as it boots itself up. The gauge does not start working until the sensor has completely warmed up which is a very short time. I really like the duel display mode with the digital display and the sweeping dial display.
    This item could be used for a tool if you own more then one vehicle. The only requirement would be to have holes drilled in exhaust pipe with the correct size bung in each for install and removal during test.
    3 people found this helpful
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    Jd 440
    3.0 out of 5 stars Bad 02 sensor
    Reviewed in the United States on February 24, 2024
    Style: CustomVerified Purchase
    02 sensor lasted 20 minutes then went to full lean. 3 dash on screen. If course it's only part not covered under warranty by aem. Don't want to remove entire system to send back to Amazon. Probably just buy a new sensor and try again. Very disappointed with sensor only lasting 20 minutes. Must be why kit is on sale everywhere because they know sensor is junk and will have to buy another one.
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    Elizabeth McCreary
    5.0 out of 5 stars Best gauge ever
    Reviewed in the United States on January 18, 2024
    Style: CustomVerified Purchase
    This gauge is a must need for sure works amazingly
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    Chris Miller
    4.0 out of 5 stars Good gauge that works as advertised
    Reviewed in the United States on January 29, 2016
    Style: CustomVerified Purchase
    Gauge is straight forward and is as advertised. The only thing that would make this better is if it came with a fuse adapter to wire the switched power vs having to hunt for a wire in your wire harnes. But since this is not exactly used for stock vehicle most people should not have a problem.

    Gauge works well, I have yet to hook up to my data loggers for my tuner to data log the analog output. It would be nice if it provided two outputs so you could tie in the synthesized narrowband output into the ECU. This would bypass the need to keep the factory narrowband.

    Reason for 4 stars instead of 5 is due to the height of the bug they provide. The bung is measured in at 1/2" tall. This puts the sensor head not far enough into the exhaust stream. I had another vendors 02 bung that was already half the height that the AEM bung was.

    Better documentation as to current draw of the gauge, the sensor, and the warm up current draw would be helpful to correctly size the fuse.
    15 people found this helpful
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    Top reviews from other countries

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    Juan Castañeda
    5.0 out of 5 stars Calidad y rápidos en la entrega
    Reviewed in Mexico on January 29, 2023
    Style: CustomVerified Purchase
    La compra fue perfecta justo lo que solicité.
    Report
    Matt
    5.0 out of 5 stars Great Product!
    Reviewed in Canada on August 7, 2021
    Style: CustomVerified Purchase
    Installed easy, wired up and works flawlessly! Exactly what I needed and the price was the cheapest out there. Fast shipping
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    Chamo
    5.0 out of 5 stars funciona correctamente, es mas rapida que versiones anteriores
    Reviewed in Spain on May 18, 2022
    Style: CustomVerified Purchase
    funciona correctamente, es mas rapida que versiones anteriores, trae todo lo necesario para montarla y marca mas rápido que aem mas antiguas
    Report
    Amazon Kunde
    5.0 out of 5 stars Ein Muss für jeden Autofan
    Reviewed in Germany on February 25, 2022
    Style: CustomVerified Purchase
    Ich habe mich bewusst für dieses älter Modell entschieden, weil ich es noch in zwei Anderen Fahrzeugen verwendet habe und es immer tadellos funktioniert hat.

    Ein Muss für jeden des seinen Motor vor abmagern schützen möchte.

    Sehr zuverlässiger Verkäufer und schneller Versand!
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    Cliente Amazon
    5.0 out of 5 stars Semplicemente perfetto
    Reviewed in Italy on January 9, 2022
    Style: CustomVerified Purchase
    Essendo un preparatore posso dire che è perfetto
    Report