air fuel ratio gauge

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I assume that you are talking about the signal wire? That would tie into the oxygen sensor. Splice into a couple of wires untill you get the right one so you get the proper signal to make the gauge work.
 
You can look for a ECU pinout at plxdevices.com, look in the support section. If all else fails, slit the wires on the O2 with a razor and check with a Ohm Meter. The signal ranges from 0-1volt. Should be around .5 at idle.
 
You can look for a ECU pinout at plxdevices.com, look in the support section. If all else fails, slit the wires on the O2 with a razor and check with a Ohm Meter. The signal ranges from 0-1volt. Should be around .5 at idle.


That would definetly be easier!
 
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