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I have a 440 that usually runs with 30-35lbs of oil pressure at idle and anything above around 1500rpm the pressure goes right to 80lbs or more.

What's weird is in the last couple of days its now running at 80lbs at idle and 80lbs or a bit more at any rpm above that, hardly any difference in oil pressure across a range of rpm's. I am reading this on a mechanical gauge straight off the rear of the block. I hooked up a spare gauge and its giving me the same exact readings. Very weird.
Could this be an oil pump regulator? Any suggestions?
Thanks,
Wolfe

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Take the bypass plug and spring out and see if the bypass valve will slide out of the pump cover easily, if it doesn't fix it. It is not unusual for debris to get into the valve and make it stick