No oil pressure on fresh rebuild

[69a]

I don't think that the vacuum pump idea will work. Post #4 because you will just suck air through the oil pipe in the lifter valley. Post #11 would work. You can put a clear plastic hose in a fitting for the pressure sensor and fill it with oil. Take the plugs out and manually turn the engine back and forwards a couple of turns and see if the oil level changes. That will tell you if the pump is turning.