Is an Air/Fuel gauge a useful tool or is it just eye candy for the neat little light? I guess what I need to know, is there a way to tune if the gauge is reading rich with out some kind of reprograming? The only thing I have to adjust is a AFPR.

eye candy, unless you have a wideband o2 hooked up to it ($$$)

Does it use the MAF sensor and o2 sensors? If so then it may be a good tool...

Autometer A/F gauges use the O2's to take the readings.

I forgot how I wired mine.

I believe it goes directly to the O2s

I think it's pretty useful, especially if u have a Laptop with LT1 edit ... which i don't

everything I've read points to it being useless without a wide band o2 sensor hooked to it. There are plans somewhere for building an affordable wideband though, but I can't solder worth a damn.

The typical A/F gauge isn't calibrated, except with the words "lean" - "normal" - "rich"...... not a lot of useful data. In closed loop, the gauge will just swing wildly back and forth from side to side, following the PCM's attempt to keep the A/F ratio slightly above or below 14.7:1. A nice psychedelic light show, but not much info, unless a sensor stops working and it locks on "rich" or "lean". But your PCM would give you a code if that happened.

At WOT, its going to show "rich", but the stock O2 sensors are not even intended to be accurate at A/F ratios other than 14.7:1, so "rich" isn't going to tell you anything.

im thinking about getting one of those glow in the dark ones because they look sooooo cool

add a third category, annoying as hell ! I have mine all the way down the a-pillar and only there is it not bashed by my fists on long trips at night