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Well I hope there is an easy answer but here is what I have done.
Checked with a mechanical gauge, still 10 lbs at idle.

I removed the plug and spring for the pressure relief (Milodon Single line - new) to static pickup
I could not see the valve . I could not feel it with my little finger.

I changed the oil to Brad Penn 20W50 and a Napa Gold filter.

I started it and now have 0 (zero) oil pressure.

Note The line from the oil pump to the pan is very short (only a few inches)

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Two things, the oil pump must have a bypass spring and check valve in it to work You can add shims between the spring and the cup that the spring sits in to up the pressure , be careful though, not to much It is NOT UNCOMMON for the Milidon external oiling systems to loose the prime when you open the system, IE remove the check valve plug or oil lines, even changing the oil and filter can cause the loss of prime some times Let us know what you find, like Raff has suggested try priming it before starting it again