Low oil pressure?

If that plug is not in there and the engine is pumping oil then let's say for example the oil pressure gets up to 60 pounds. The bypass in the pump opens and drops the pressure in the pump so then by not having the plug in that line the oil goes back to the filter and it stops going up to the top of the motor then pressure drops bypass kicks out oil pressure builds up again feeds the top of the motor. Until pressure builds up bypass opens in the pump and once again the oil pressure drops.