I disagree with Paragon.
Air cooled or not, 100HP or 350Hp, the oil pressure must not ever drop to "0" when running. Really a no-brainer...
And this was in fact what was going on with the Pinzgauer. The pump (gear driven) would produce enough pressure at higher speeds/lower gearing to increase oil pressure, while the looseness on the oil pick-up tube was enough to cause a pressure loss when the RPM's were low to medium, so depending on speed or gearing, I got the same readings as you, up and down.
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