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An easy way to tell if the gauge is working and the sender is not, is to take the wire off the sender, and ground it. Turn the key on, and the gauge should peg itself, reading 100% oil pressure. If not, you have a bad gauge or bad wire.
DO NOT DO THIS!!!

It will ruin the gauge in the cluster.

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).