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The BBB suddenly after warm up has low oil pressure

Albany, Oregon
This motor in 'Big Blue B@sterd' is a 2nd hand one from a wrecking yard that I've been running for about a year. Normally oil pressure ran 40 pounds after startup but recently it starts at 40 and drops down to nill afert about 7 minutes of drive time. In the hopes of a gauge or sender issue, I found a free replacement Insturment Panel but the readings of oil pressure were the same but the Volmeter was working on the replacement IP.
Next I had a shop replace the sender, given my back issues I couldn't make the reach, but this had no effect either. The shop verified that with motor at operating temperature with an analog gauge it was pushing 40 pounds, but I think I should see that for myself. There are no secondary indicators of lack of oil pressure, the motor's not heating up and the rocker arms are not rattling not are there any other unusual noises in the engine compartment. Where should I go from here?