If you look in the larger of the two holes labelled 'prime here'.. just pour some oil in there and work the shaft back and forth (giggity). Odds are that step's unnecessary as my pumps are really tight, but it never hurts
(giggity). After you get it on the engine, make sure to fill the oil filter as much as you can before spinning it one. And if you have open oil lines hooking up coolers and such it never hurts to pour some in there too.
You'll notice when you drop in the oil priming tool, the pump will catch it's breath and bog the drill down pretty quickly.
Oh yeah. Make sure there's oil in the pan too. Nothing like sucking up a big gulp of air and having to start over.