it could be the gauge or sender, but the fact that the idiot light is coming on is trouble; it's a different sender (switch) and it seems to be confirming your gauge.

stop driving it until you can check it out with the recommended proverbial gauge. such low oil pressure, whether from a failing oil pump or from some other problem, can cause all sorts of damage even sitting there at idle. that idiot light comes on at some rediculously low psi.

//bc

1992 sohc trooper 3.2l v6 automatic . . . as is

i love a good intermittent electrical challenge. . .especially when it's someone else's.