The pressure switch grounds the wire when there is no oil pressure.

Ground the wire manually with the switch disconnected and see if your light comes on. Should be off when you unground it.

It that works ok then your switch is bad.


67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......