Here's a picture from my original '88 engine. The O2 sensor wire comes out of the main harness that's covered with foil tape, near where it attaches at the engine / trans joint, right alongside the steel coolant tube.
John
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1966 GTO Post Coupe, Barrier Blue / Parchment, 4-speed, A/C
1988 Fiero GT, T-tops, 5-speed, 3.4L engine swap
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