I have an AutoMeter Air/Fuel Ratio gauge and I have the power hooked up to it but the purple wire that it has is from what I have been told is supposed to hook up to one of the O2 Sensor wires. I'm really not sure what color that wire is or where I can find it or if I have been mis lead on what to splice it in to. I need to find the easiest wire to hook it to, where it is located, and what color the wire is. Can anyone help me? It would be greatly appreciated.