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I used to see the same effect on my road tractor. I drove as a team driver and the truck was driven almost 5,000 miles a week which also happened to be the oil change interval. After 2,000 miles or so the oil pressure started to increase by 5-10 psi.

Just purchase a 1/8" npt T and some fittings and have both come off the same port. Increases in oil pressure typically are seen when the resistance in a oil filter increases. How long has it been since the oil was changed?