Is the fuel pressure gauge one of the sealed types? If so those always read low when it is hot under the hood. You can drill a small hole at the top of the gauge housing to cure the change in reading when the under hood temperature is up.
Opps just read the rest of your post. You already have a vented gauge. I would check your vent at the gas tank.
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If you built it, drive it.
red 62 Tempest total stock restoration.
white 62 Tempest modified, 61 389 Tri-Power, and a conventional drive train.
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