alright so I'm a noobie here and I have an a/f gauge from my other car and I purchased the autometer dash bezel but there's one do I tap into the o2 sensor w/out going through the ecu.. also, I have searched about this but have only seen stuff about the 02-03 and I have an 04 wrx, I'm not sure if they are the same. here's what i do know... the sensor has 4 wires, 2 white (which are signal in and a signal out) a red , and a black (those are obvious). but does anybody know which of the 2 white wires is signal in and out...?