I am not 100% sure what you're asking, but I think it has to do with the low oil pressure warning light.
The exact operating pressure typically is 5 - 7 PSI.
If you now have 1/8"npt, go to any domestic auto supply and order a idiot light sender for a 1978 - 1983 Chevy Monza. Screw it in and connect the single wire.
Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)