jhell00

im hooking up a a/f ratio gauge and im in need of some help.... theres 4 wires, 2 white, black, gray. the 2 white are heaters and whats teh black for and the gray for... i would ammume that the blacks the ground and the grays the sinal wire but i dont want to so please let me know if u know...

cyle_greenhill

black is ground and gray is signal. I asked the senior master ford technician that I work with so rest assured that this is correct.

jhell00

ty... so what would i hook the positive up to? i dont want my gauge on all the time...

jhell00

hey please help i got my car on ramps waiting to hook up the last wire... the positive

cyle_greenhill

I'd put the positive wire on the instrument cluster fuse in the inside fuse box. that way the gauge would only come on when the car is started.