Intermotor 50721 oil pressure switch. Item is new old stock ex motor factors stock. The metal has tarnished but not rusty.
FITMENT
BMW E34 M5 1989 to 1996
BMW E30 M3 1985 to 1991
BMW Z1 1988 to 1991
All above info has come from a intermotor parts book. Please make sure this is the correct part you need before buying.