All right, i know not everyone here may be a supporter of sucha useless gauge but....im havin a bit of trouble hookin up my air fuel. its a 1991 hatchback with the sr20det swap, i have good hookups to ground and 12v, but the actual o2 sensor that im tapping into is giving me trouble i think. first, does it matter which wire i tap into as long as it goes to the sensor, and second, should i tap into the part that goes from the sensor to the harness, or from the harness to the ecu? thanks for any replies and/aid yet to be received

 

2 days and know one answered. I have no idea but try to hook it up to the actual o2 sensor wire if you you hooked it up to the o2 wire or the one the goes to the ecu im guessing is the same thing. Just try it and see what happens.
Ryan

 

I'd hook it up to the wire going to the ECU. According the the FSM for the KA, its pin number 19 (white wire.) I'm not sure about the SR ECU, though....

 

if u have an ohm meter you can find out which wire is ground, sensor and heat if it is heated