5.0sTheWayToGo

I have a 1994 GT and im trying to hook my air/fuel ratio gauge up, but i cant find which wire coming from the 02 sensor is the signal wire. i need to piggy back into that wire. My O2 sensor consists of 4 wires. A black, two whites, and a grey. IM thinking the black is for ground, the 2 whites for heater possibly, and the grey may be the signal?? help me out here

Black Snake

I was going to ask the same question,

Also with O2 sensor do I hook it up to? The Left? Right? Both?

marx91

i thought it was the black wire

5.0sTheWayToGo

anyone else? im hooking mine up to the drivers side, because thats where i have my hole coming through the firewall

ZachW04Stang

If its a bosch sensor then gray is ground. Black is the signal wire. The two white wires are for heating the o2 sensor.

Black Snake

So you only splice into one O2 sensor? Not both?

luckythirteen13

yes you only tap into one. some one, cant remember who, wired up a toggle switch so he could flip back and forth and read both o2 sensors (not at the same time). if its like the 5.0's, the black is the sending wire.
narrow band o2s are nothing but a light show anyways. wont tell you anything except for at wot.
i have a narrow band and an lm1 wide band. the wide band will move between 14.6 and 14.8 at idle and the narrow will be all over the place

turbostang21

like lucky said a narrowband 02 is useless as far as tuning...but it hypnotizes women into dropping their panties since there's only a few wires to check you can also just stick a pin etc into the wire and touch the guage's wire to it and see if the gauge works (with key on) as a last resort

5.0sTheWayToGo

Ok well im lost because i went to the mustang shop today, and they told me differently. they told me that grey was the signal,black ground, and 2 whits for the heater.

marx91

hope this helps
http://www.egauges.com/ATM_Tips.asp?...uel_hookup.htm