which wire for air fuel gauge??

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Not sure how much data you can get off the stock narrowband O2s - just a lean or rich reading.

You'll need a wideband to get a true reading (from one of the analog 0-5V outputs)

To hook up a gauge designed to work with a narrowband O2, I believe these are the wire colors you can tap at the EEC... double check the wire colors on the O2 harness.

Left NB = 43 (R/BK)
Right NB = 44 (GY/LB)
 
Doesnt mater what wire you hook it too, all it does is make a light show and tell you nothing. Hope you're not epilleptic :)

Without a wideband o2 its absolutely pointless.
 
i'm pretty sure the OP got this installed 4 years ago at this point.

Red79mustang, this is a 94-95 mustang specific forum, you'd have better luck checking in the fox 5.0 forums for an answer. best thing in the world is the search button.