Air fuel gauge
 

i just picked up a air fuel ratio gauge and i was trying to figure out what color wire i need to use for oxigen sensor, the ECU one im guessing.

either i did find the right one and its telling the truth and the car is running beyond rich or its just a wrong wire :)

those ones are not really that reliable or accurate for that matter

i wouldnt trust that gauge 4 sh!t

i already know that its not that accurate, but the fact is the car is running rich. i already knew this, but i just got it so that when i buy or fix things its good to know if im acually doing anything to get it closer to running right.

It's not just a matter of how much info they display, but the consistency of it. Try connecting a volt meter to the O2 line and you'll see the signal bounces all over the place. Unless the gauge is heavily buffered (in which case it's worthless for a different reason) it's still not going to really provide you with any decent information... not even a good basis for a hunch.


As for which wire, what year and model are your car?

87 turbo, its got the heated wires for the 02.

'87-'88 Turbo ECU pinout is here: http://www.fadingworld.com/Supra/MAF...0-%2087-88.jpg

Don't refer to the diagram for anything else though, it's incomplete.