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Im Just trying to figure out Which line off the O2 sensor to tap for an air fuel ratio gauge?? any help would be greatly appreciated. Thank you
 

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black wire is signal I believe gray is ground.
 

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At least on my car, here were the voltage readouts ..

White wire 2.5v black wire .02v
gray wire 0v white wire 12v

since the circuit was never closed, the ground had no voltage (gray) signal will be less than 1v the two wires are heater wires, I believe one gets switched from 2.5 to 12v and the other is a constant 12v (heater wire)
 

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i'd try that first, or use a volt meter to double check
 
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