Oil pressure numbers indicate BAR. 1 BAR is one atmosphere, 14.5 psi. Thats not really anything to worry about with a hot idle. If your unsure, connect a calibrated mechanical gauge directly to the engine and read the actual to confirm. But if it instantly rises to 3 (43 psi approx), no worries.

Fine line between low mileage cars that sit, and high mileage cars that are driven. If you drive them they wear out. If you dont drive them, seals detierioate, oil dries up, parts rust internally. Fire up a machine that's sat a while and all kinds of stuff can occur. Or not. Its kind of a roll of the dice and depends on how long it sat, temperature fluctuations, humidity, etc..

IOW, not uncommon to see a water pump puke after a car sat a while. I have seen differentials with rust on the internals that sat above the oil (transmissions too, BTW). And there is a reason that motors freeze in position, after a while. Cars that have sat long periods are well known to self destruct shortly after coming out of the coma in what appeared to be good health. Not all, but enough to make some of us cautious. Just drive it and fix what breaks until it settles down, or you can no longer handle it.