When I got my 93 Civic someone had done a lazy job with a b20 swap and there isn't an oil pressure switch connector I don't know where it would be exactly, I know it near the oil pressure switch on the back of the block but I can't find it. And the same thing with the power steering pressure sensor. I found two wires in that area with no connector one is red and the other is yellow with a black line but I don't know what they are. If anyone knows anything please help.

 

The Purge/Cut solenoid uses the red wire and the yellow/black wire that you have described, so that would NOT be your PSP switch. Wiring for the PSP switch would be a black wire and a green wire. The single wire for the low oil pressure light on the gauge cluster that attaches to the single pin wire on the back of the block just to the left of the oil filter would be a yellow with a red stripe wire.

 

The two wires are wrapped together and have a rubber piece at the end like they are for the same thing and had the connector taken off. It's a yellow wire with a black line I'll look in better light tomorrow.