I got my NARROW band a/f gauge installed and must I say that i think its a piece of crap and a waste of money. The thing only reads right under 80% open Throttle when the pcm isnt in closed loop and on top of that the average car is gonna be rich under hard acceleration anyway. so whats the point? Look at the pretty colors? Not to mention when i take my foot of the gas it eventually just reads lean or doesnt light up at all for a sec then just goes back to jumping around as the stock pcm map changes a/f for the right exhaust emissions, I bet you couldnt even use this gauge to help tune your car. I regret even buying one, guess i better start saving for an AEM UEGO. Any comments take a shot, im just hating.