Found my dads original 1971 duster!

missing linc said

When the key is in the 'on' or run position, power is supplied to most circuits, and I would expect the coil to be warm for sure, probably the alternator too. Most modern cars the battery would likely be dead after 2 hours.

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Well that is great news! I’m hoping that’s what caused it. We had headlights on for a good portion of that time too. Everything now seems to be working perfectly. I just need to try taking the Teflon tape off of oil sender unit to see if that fixes oil pressure gauge issue