I am using a 3 wire O2 sensor off a 92 vette, because of my long tube headers. On the wheather pack it says a,b,c. C is a black wire I am assuming a ground and b, and a, are both white wires one a signal wire and one a power wire. Which one is which A is on the outside, B is in the Middle. I need to tap into the signal wire for my autometer 02 gauge.

Any info will be greatly appreciated.

 

i believe either will work, one for incoming power and the other to your gauge. might want to look on autometers site, lot of people put up installtion instructions.

 

The black is the signal wire, and the white wires are pos & neg. It doesn't matter which WHITE wire you hook up to the pos, cause it's a heater. nothing more.

I know, it's kinda of wierd but it's the odd man out thats the signal wire with these 3 wire O2's.
Did one last week, and assumed the same thing, lucky I researched it, and didn't blow up a 45 dollar O2 or tap the wrong wire & smoke the gauge.



Ron

 

Thanks for the info.