If it is the Auto Meter red is 12vdc, black is ground and purple is the O2 signal. I hooked my signal wire up at the computers 60 pin connector. Don't know what pins they are on your car (not sure but I think 87-93 are same) on mine (92 GT) they are #29 right O2 and #43 is left O2.
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92GT Lowered with Ebiach's and Koni's, Kenny Brown subframe connectors, lower G-brace and jacking rails. BBK upper and lower control arms, polyurethane bushings all around and Ken Bell blower, ram-air, 80mm mass air, SMC Alky Injection kit, J&S Knock Gaurd, TwEECer RT and a bunch of other stuff!
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