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I think the gauge may be defective because it reads 40psi when the car is off, so of reads 40psi higher than usual... At least that's what I'm hoping...
Well I know the oil pressure is greater when it's cold but it's pretty much always above 60psi at idle.... Oil pressure wouldn't be maintained when the motor is off right? I have a vortech supercharger and i took out the oil feed line and started the car to make sure oil was flowing (which it was) and I kept it disconnected, turned off the car, and checked the pressure and it was still 40psi when the motor was off...
Pull the wire going to the sensor , see if it drops to 0 , if so , buy a new sensor. If not , you have bigger problems with whatever controls that system.