Does the factory m54 oil pressure switch have two wires? I’m transferring over the wiring harness from a dead engine to a replacement engine, and included the oil distribution block for my oil pressure sender and Temp sender. In the pic the orange wires connect my gauges to the oil pressure sender and the oil temp sender. I’ve got two leftover wires in the factory harness, a black and a black/yellow wire. I think the black/yellow is a single wire for the factory low pressure switch which I'll attach to the empty terminal on the sender, but can't remember what the black wire is for.