I agree with the suggestion that the original gauge was wrong .... first startup of the year, cold oil tweaked the mechanical gauge to read what it should have been reading for years.
Two readings agree, one does not. I'll put my money on the two that agree.
Don't assume the first gauge was correct just because it was in the car a long time. Could have been malfunctioning for years and the recent first cold start of the year freed up some sticky linkage.
What pressure pump are you using? Those numbers look normal to me, about exactly what mine runs with an 80 psi pump.
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