my girlfriend got me a few gauges the other day for my birthday, and one of them she got me is a pro sport a/f ratio gauge. i know its not a wideband so im not gonna get accurate readings, but i just wanna put it in for now so she doesnt think that i dont like it. i know how to wire everything up for it, i just dont know where the o2 sensor signal is. btw my car is an 05 wrx, and im pretty sure it has to go to the ecu. does anyone have a diagram so i know wat to hook it up to?