oil pressure disappeared.

Just a thought, you could loosen the oil pan bolts to allow it to drop down just a little then try and prime the oil system. This might tell you if the pan is against the pickup and sealing it off?
I was thinking just that. Right now, I have to determine the most likely candidates, 1. pickup,, is it up against the bottom of the pan. If so, loosening the pan a bit would allow priming the pump.....If that doesn't work, pan has to be pulled to determine if I broke the pickup. 2. Pump is bad, either the relief valve or the pump itself.

@RustyRatRod I will check tomorrow