Hey guys I just picked up an Autometer A/F gauge, what wire do I tap for the signal wire? My O2 sensor has 2 black wires, one Green, one white, and then three wires that come out the connector that it plugs into. I don't want to tap off the O2 sensor but off the harness leading to the O2 right?

Thanks

 

it should be the white one. if your runing a p30 or p28 ecu it should be d14 on the harness. make sure you let the car warm up before the gauge starts working on those 4 wire o2 sensors. hopethat helps.

 

I tapped the d14 wire by the ecu on the harness.
(eg,d16z6,p28 ecu)

 

I believe it is the white wire. I tapped into the harness near the O2 and the ECU and I had nothing but problems in my 93 si. Never did figure it out but the car hesitate sometimes while driving whem I had the gauge hooked up.

 

Hi i have an A/F autometer gauges too. i hook it up right it was working fine. but some how and i turn on the headlight at night it start to run lean and stay in lean i don't know what happen is it cause of my O2 sensor or the a/f ratio mess up or broken thank you