AEM UEGO Air/Fuel Ratio Gauge 30-4110

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.

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.

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.

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.

Se instala fscil, no necesita calibracion, solo en aprox 2 mese dejaron de funcionar los focos, pero amaxon me lo cambio.