Sounds like a bad oil pressure sending unit.
Try unplugging it and see if the gauge drops to zero. If it does than replacing the oil pressure sending unit will most likely fix your problem.
It is not easy to see or get at but you can find it on the back side of the engine on the drivers side, kind of in between the valve cover and the intake plenum
I’m happy to assist further over the phone at
https://www.6ya.com/expert/jeremy_d728a59f986299fa
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