Pegged oil gauge: It could be a simple electrical problem.

Does the gauge peg full scale as soon as you turn on the ignition?

If so check the wiring and the oil pressure sender. A open circuit (sensor to gauge) due to a broken wire or bad connector will peg the gauge. A bad oil pressure sender will do the same.

To test:

Unplug the wire from the pressure sender and touch it to ground. If the gauge "un-pegs" then the wiring is OK but the sender is bad.

If the gauge remains pegged its a wiring problem: look for a break in the wire or a bad wire-to-sender connector. The sender in this case is probably good.

Regards,
bobf.

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