Which wire would i use directly onto the lambda sensor for an AFR gauge? I've already got it plumbed into the proper wire at the ECU, but i'd rather have it near the lambda. I think i have either black, white or red.

 

Ive got an AFR on my 93wrx, from memory its got 3 wires, 2 are power, which i wired straight to the battery, and the third one isd the signal from the lambda(or ecu connection). I wired mine near to the ecu.

Sorry i cant remember which terminal it is that feeds the signal.

Frank