Hey, I need help installing my Air fuel ratio gauge. I think one is power and one is ground But however I am not sure what the other ones are for. Which of the 4 O2 sensor wires do you connect the other 2 wires too. Help me please... Oh yea I have a B18B

 

um a/f gauge has 3 wires. One 12V switched power, one ground and one to O2 signal. The one to the O2 signal goes on the white wire of the o2 harness.