Air Fuel Ratio Gauge with O2 Sensor, Digital Display 2-in-1 Air Combustion Meter

Purchased this gauge so I could install an AFR sensor for my piggyback ECU to monitor and adjust, I had high hopes for the price point and was not disappointed. The 4 face configurations is really neat and love the fact it came with white ones to match my interior (as shown, sorry for the crappy panoramic photo). The sensor wire, and the gauge wire to the sensor were both plenty long, and wiring in the power wire was super easy, it also includes a monitor wire (like use for the ECU) and a serial wire on the power line pin connector. Overall I am very satisfied with the quality and performance of it, the readings are instant (it changes with the slightest chance in throttle so virtually instant). Would buy again without a doubt! Also includes very detailed instructions which was super convenient.

AEM is a well known company in the car world, and makes high quality products. I purchased this gauge to monitor my AFR and log for open source tuning purposes. Installation was painless and took roughly 20 minutes since my downpipe already had a bellmouth o2 bung. I strongly recommended that you buy an add-a-circuit fuse kit (ASIN B01LFXA5UA) if you don't have any, it will make installation much easier so that the gauge can be powered by one of your car's powered circuits, like the radio. I had a few spares laying around, so I spliced this gauge and a boost gauge to one fuse kit without any problems. The kit also comes with several butt splices although one would suffice. The cables for the gauge are extremely long, so be aware that you must have adequate room to tuck them away. I paired this gauge with an AEM boost gauge (ASIN B001DX7KMY) and SMY Dual Gauge Cluster (ASIN B01M7MEKUS). The numbers are also very readable in the day time and stand out in the night, although the sweeping color band is a bit washed out during the day but still visible. No issues with this gauge and I'm very pleased! The AEM sticker that came in the box was a bit damaged, so I only gained +4 HP instead of the expected +5 HP.

I have been looking for a AEM wideband AFR gauge for a while now and i finally saw this on Amazon for an awesome price. They usually go for more than $200. This gauge works perfectly and is an authentic AEM gauge. It comes with 2 gauge face colors, black n white, and it includes all wiring needed for installation and easy to follow directions.

Easy to install, straight forward and I love how much wire they provided. After I neatly installed the gauge, I had plenty of wire to wire tuck and to hide it away out of sight. Refresh rate and accuracy of AFR’s blows its competitors out if the water. I would highly recommend this to anyone that wants to know exactly what’s happening in their exhaust

This has worked great on my race car for several weekends. Love the fact that it does not need to be calibrated in clean air like some others. I have 2 Innovate Motorsports Wideband gauges on other cars and they seem to constantly need to be re calibrated and to do that on them you have to remove the O2 Sensor and that can take 20 minutes. The next one I buy will be a AEM.

Simple installation and works great. Very easy to read digital and range LED graphics. I am using it to tune and monitor an older twin carbureted engine. It is sensitive enough to quickly read ratio fluctuations so it does jump around under normal driving, but I prefer it like it is to get a feel for how the carbs transition under acceleration etc. I am very pleased overall.

What can I say, AEM is AEM :) I bought this one for my friend. Previously bought 2 of them, one for me, other one for my other friend. Mine is installed on Toyota Mark II IR-V. Second one is installed on friend's V7 STI, and this particular item is already installed on EVO 3. All of them are working great! Installation is very easy, and package contains everything needed for the installation.

As always AEM has come through with another amazing product. The new bosch LSU 4.9 sensors are blazing fast and have better accuracy as well. This is a great gauge and I highly recommend them to everyone and anyone who needs a wideband. Great company hands down the best wideband on the market in my opinion.

Bought this to put on a 1915cc VW powered sandrail with a 2 barrel carb. This thing is an engine saver. The jetting was all wrong in my carb so I changed all the parts out and it runs better than ever before. Important that you dont mount this near the exit of the exhaust because you will get inaccurate readings

It was as expected I got it for 25lb of boost running E65 on a 1.4T. It reads fairly accurate for expected values. Little bit on crimping or soldering connections you install but ultimately it works well, goes through set up quickly, and hasn’t had any issues in the first month of use. Product arrives as expected.