[97Stallion]

I believe it's the same as 94-98 Mustangs, but I believe it was a gray/red or a black/red wire

 

[97Stallion]

Yeah it has to be the right wire or it could screw up the gauge. Let me look when i get home and I'll post it. But the more I think about it, there are 4 wires, I think one is white, one is black and the other two are grey. Just let me get home in about an hour or so.

 

[97Stallion]

D'oh!! Well I completely lost my memory, but I know for a fact it's either red/black or yellow/blue now. let me do some more investigating

 

[97Stallion]

OK, well I'm like 95%, not 100% that's is the red/black because the yellow/blue has the heating element so I'm going to assume that wire goes to the computer to let it know the temp of the O2 sensors and the red/black one actually relays the signal. I hope this work for you. If you want me to be 100% sure you'll have to wait till saturday when I have time to jack up the car.

 

[97Stallion]

I just wanted to restate that I finally got a chance to check the wire I attached my A/F ratio gauge to was indeed a red/black wire, so now I'm 100% positive of this.

 

[97Stallion]

For those who do not know, the red/black wire is located before the driver's side front 02 sensor connector.

 

[97Stallion]

i wanted to get an autometer a/f guage too. is it true that they are not acurate?

i would have to say that's like 60% true. Is it going to come straight out and say your A/F ratio is 12.7:1 or something like that, no. But if you learn how to read it correctly, it'll give you more or less an approximate reading. If you're looking for something that gives you an exact number, then you'll need a wideband 02 sensor which usually costs around $400.

 

[97Stallion]

That mainly pertains to blown engines. Because they have to run a little richer in order to be in the "safe zone" on a N/A car, you can run pretty lean and still be ok. On a SC engine anything about 13.5 and you're pressing your luck as to on a N/A engine you can do about 14.5.