How do you prime the oil pump?

Today on PowerBlockTV they primed a new style 4.6 distributorless engine using a tank filled with oil that was pushed with 60lbs of air pressure through a oil sensor port on the block. Showed oil pressure on the guage as the oil got passed through the engine. Look at the video around the 8 minute mark.

http://m.powerblocktv.com/episodes/TK2013-02