Mini starter RPM

When I primed the engine with my Bauer electric drill (up to 1700 rpm), I checked the oil pressure with an ohm meter - about 18 ohms (roughly 70 pounds pressure) and the factory gauge went about 1/3 of the way.

However, when I spin the engine with the mini starter, the factory gauge barely moves and the ohm meter shows about 25-35 ohms (roughly 40-50 pounds).

So, I am convinced this car is the embodiment of Murphy’s Law, and I will now get a mechanical OP gauge.

But this leads to another question - at what RPM does the mini starter spin the engine?