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Contrary to some comments, there is oil pressure in a Model A engine as it is being forced up into the valve chamber. From there gravity does the work. If there were no pressure, how would a pressure gauge show a reading? Having said that, a Model A does not have a pressure oil system.
If your gauge is showing no pressure and than 10 lbs and than back to no pressure and didn’t do it prior to your removing the oil pan. Your asking a good question.
If it were my car I would check things out before running motor. The gauge could be defective, or you might really have a problem. It’s your call. It’s your engine.
I only say this because as I said earlier, I had a similar issue many years ago. Enjoy.