I think the air pressure port is 1/16th NPT, put a VDO sender (same as oil) and wire it to your oil pressure gauge along with a switch to toggle the gauge between the accusump air side sender and oil pressure sender. I called vdo and they said it was ok, and canton will give you the thread for the air pressure port. I was going to do this but never installed my accusump since my fuel filter is in the tunnel and blocks it.
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