AEM 30-4900 Wideband Failsafe Gauge

Works very well - it took some time to get installed but probably more my issue than the gauge. Learning more about the settings and data but good info to have for my built turbo car.

2011 Turbo Hayabusa Est 400whp on E85Bought this for a combo boost/wideband. I will tell you this: THE ANALOG OUTPUT CAN BE TRICKY TO PROPERLY CALIBRATE IN YOUR TUNING SOFTWARE. The sensor is linear but ONLY between .5 and 4.5v NOT 0-5v. if your tuning software or datalogger can accept a fully custom calibration table you will have no issues. other software that assumes 0-5v linear may have some issues unless tweaked. When in doubt the gauge is right 99.9% of the time so rely on those logs if you have to.The built in software is simple to use and easily allows setting limits for the included alarm triggered ground output which can be used to kill boost, ignition, trigger relays, activate lights, or anything else with a maximum 1.5a draw.Overall very impressed. Amazon also had the best price after shipping. If the warehouse is in your state they DO collect tax now so be prepared for that.

This is the only wideband I buy anymore. Works too well as a safety device, datalogger, and clean gauge, that its pointless to buy any of the others.Save your money and your investment, and pickup this dual gauge, wire in a proper safety signal, and go enjoy your car/bike.

Bought this gauge to replace my existing aem wideband for the failsafe and datalogging abilities and now i really wish i didn't.From the very first day the lcd panel on the gauge would work sometimes,other times it is either blank or scrambled.In addition to this the backlight does not work.Having spent $277 I would have expected better quality control and now I am seriously wondering about the accuracy of the gauge.The seller referred me to Aem support which is extremely slow with limited feedback and after a week i still have no idea if the gauge is going to be replaced and i think it is a pretty hands of approach by both amazon and the seller(why should I have to deal with the company directly for a defective item?).

One of the best gauges AEM has to offer for turbocharged vehicles. AFR and PSI in one gauge with logging! Only complaint or quirp I have is there isnt a button to swich modes on the face... not a necessity but would be a great feature.ProsLoggingAccurate- IMO one of the most accurate AFR gauges the market has to offerDurableLooks greatCustomization - change the thresholds and colors for thresholds on PCConsVacuum hose size seems to be a non standard size that connects to the back of the unit. Had to use a step down adapter to connect the two pieces to vacuum line.

Guage looks cheap and feels cheap, specially with the trim and faceplates being exchangeable. It's not so accurate when using the outer LED's to meaure anything as the LED's aren't lined up with the numbers in faceplates. I'm using the boost outer ring and you can't really tell where 8psi is because the led is just below it. Its more of an estimate. The center display is spot on and nice and bright. If it weren't because AEM made it and i'm sure the internals aren't cheap, i wouldn't have paid this much for it. Overall is great for boost and wideband reading.. all the other features are a bit cluttering and considering some boost gauges run for over 200 this is a bargain.

Gauge is easy to install and simple to use. I haven't tried setting up the fail safe feature yet but I have my AFR and boost ready. Works great in the daytime but terrible at night. This is one major design flaw. There is no back light that lights up the face. All you see is the outer LEDs and the center digital reading. Whoever did the R&D for this goofed big time. You're basically guessing at night with your outer LEDs. This prevents it from being a 5 star review. It's good but not great.

I have had this in my car since 2013 now and I love it.Only complaint would be that it is not the newer 4.9 sensor. But it works well and the ability to program it how I need is amazing.Update (July 2019): Still in the same car working great!

They are wicked. I use for data logging on a snowmobile. Rpm a/f boost

A must with a turbo setup vehicle, works good easy install, very pleased,

Works great love it