Best bet is to hook up a manual gauge and check what the actual pressure is before you start to panic. Could be normal operation of the gauge with 45 years of age. Could be a sender/wiring too. Not sure if there's any adjustment on that gauge or not.
Good to see another AZ birder. I'm in Mesa.
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Rich
64 Hardtop
79 Heritage
89 Crown Vic wagon
03 Mercury Marauder
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