[Kracka]

Drain the old oil out, refill with new oil, and start the car up; this will be the fastest way to build oil pressure. You won't be able to build up much oil pressure by just cranking the engine since you're only getting a few hundred RPM's. Once you start your engine, it will have pressure within 1-2 seconds and will put a lot less wear on your internals than sitting there and dry cranking it repeatedly.