Not sure how many engines this works on, but here's the part number from NAPA.
Oil pressure alarm switch 318s (mine is a 1985)
ATM 1431028 or ECH OP6612
$5.49
These things leak all the time. Carry extra ones!
1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL
RETRO BOATS ARE COOL
If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.