So far, I haven't been able to come up with a complete answer to this. If I'm installing an Air/Fuel guage, what wire has the signal or where should I get the signal?

on an 2004 f-150 (new body style)
Thanks everyone

 

What brand is the gauge? It should have come with instructions.

 

autometer,

it just says to find the signal wire from the 02 sensor

i don't want to have to unwrap all the wires to trace it back

 

4 wires. 2 whites which supposedly are for the heater circuit. So should be either the black or grey, I would guess the grey.

 

Unless you are getting a wideband 02 sensor like the Dynojet Wideband Commander or LM-1, you are wasting your time and money. The factory narrow band 02 sensor will tell you nothing as far as A/F is concerned. And seriously, there is really no need to read A/F full time on these trucks unless you are forced induction. Save your money.

 

There is no reason to monitor something you can't change in the first place. Unless he carries around his sct pro racer package around in his truck full time, and even then you would need to find out load, rpm, ect, act, etc...