Before you install it fill it with oil and rotate it a few times this will ensure oil is in it. That alone will be enough I do them at work that way. Option 2 get an outboard engine lower end hand pump and self prime it thru the oil pressure switch location after install. Pump is like $10 at Walmart or parts store. Pretty much you just need a little oil in the pump so the gears seal while it spins and it will suck oil.