also worth mentioning that the oil pressure switch on these is a pretty agricultural device comprising a spring and a flat disk of metal. its particularly befuddled by modern oil. back in the 80's oil was mineral based gloopy and thick, modern stuff is a fabulously hi tec wonder of science, but its pissy thin watery stuff, so if youre running synthetic oil, before you spend any more money, put some oldskool oil in your oldskool motor.