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I am trying to install a autometer air/fuel ratio guage, but my O2 sensor has 4-wires and I'm not sure which one is the signal wire. 1-white, 1-purple, 2-look brown. I also know that I have to connect after the wiring harness. Any help would be highly appreciated.
Well I can tell you this much at least. The stock sensor on my car has a purple wire so I would guess that is the signal wire. The two brown ones are probably for ground and 12v and it won't matter which one you put on what. As for the white wire I don't have a guess.