I had the same problem and said OH NO! (Thinking oil pump went out...)
So I removed the oil filler cap and peeked inside the engine with it running. Plenty of oil flowing to lubricate everything!
So the oil pressure sending unit was a LIAR! I replaced it and it now indicates oil pressure at idle - low like 1 or so when warm, but no longer 0. And it goes up to 3 when I am driving.
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