Wiring diagram question???????/
 

I have a 94 stang, want to install a Air/Fuel ratio gauge in it. Don`t know which wire to hook to in the factory harness, The O2 harness has 4 wires, Please let me know if you have any idea which one I have to hook into. The gauge is an autometer, it has 3 wires, black, red and purple, thanks for any info you can give me!!!! :D

look on the actual o2 wires at self by the headers all of the colors on the o2 wires should be the same except one..which is either black or white i cant remember

later
raini

Go to Autometers website and click on Tech Tips/FAQ. Then click on, violet signal wire, and it tells the pin #. http://www.autometer.com/hp/index.html