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My first thought was the bypass opening as well but as I recall from running just the oil pressure gauge before the filter was instilled, as the engine was warming up, I don't remember the pressure dropping like that. I have tried to find an equivalent to the Ford FL-1 filter that doesn't have a bypass to see if that is the problem but it appears that no one makes a filter with a 3/4-16 thread that doesn't have a bypass.
I am going to fill it to the full mark and see if it still happens. As for the oil change, the car was using straight 30 weight and I now run 15W-40.
I appreciate all the responses and suggestions.
Steve