There shouldn't be any gasket problem that would block
oil flow. Don't worry about your drill, just run it counterclockwise wide open and even smoke it if you have to. You will be able to get full pressure if everything is working properly. If not, the first thing I would do after pulling the pan is one; make sure pick up tube is attached, two; put some clay on the bottom of the pickup and put the pan back on. Then remove it and gauge the thickness of the clay making sure there is proper clearence. This alone is usually the problem when
oil pressure is low or non existent.
Tim