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what color wire is the signal wire to run a a/f guage? (o2 under the hood on exaust manifold )
 

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B1S1 white
B2S1 black
B1S2 white
B2S2 white

those are the colors of the wires between the ECU and the conectors of the sensors, not the wires on the sensors. if you are putting A/F guage, i don't think you should be using any of those sensors, you should get a Wide Band sensor.
 

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i would say connect it to ur ecu. what year car is urs. i can tell u what wire to hook up to in ur ecu if u let me know if urs is a 01 or 02-05.
 
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