I'd have an
oil pump drive in hand and an 1/2' drill that turns counter clock wise before I really try to restart again. air doesn't take much power to turn up. If your moving
oil you'd be surprised how much power it takes If it takes a bunch of powerfor the drill motor to drive the
oil pump and no oil pressure I'd blame the plumbing arangement. Some oil filters have oil drainback check valve, if the oil filter is plumbed backwards the check valve would stop flow and most likely not show and pressure on gauge. Take a valve cover off and you'd be surprized how much oil is going to the rockers,