Please help!! no oil pressure after oil change!!
Well the good news is that you can pull the pump and replace it externally.
You might have a crack in the pickup tube, leaking air.
Cranking it with the filter removed was a good plan......it removes head pressure (resistance) to the pump and renders the "easiest" pumping condition.
You might pull the dist. gear and see if you can prime with a drill.
There's an oil ring up in "on" the pump snout in the engine. These can fail