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Does anybody recall where the small black/red wire coming off the BP fuel injector harness from EGT goes? Is this one just going to a ground?

Only single wire on that injector harness I think and I can't recall what it was attached to before it was disconnected.

I guess it's black with orange stripe looking at it today. It only has about 6-8" reach to anywhere on the right side of the fuel rail. The old one clip on the end of the wire had what looked to be an end from a sensor much like a coolant sensor but that spot is already taken on the thermostat housing (is there another for fan relay somewhere?).