seadoo oil pump or premix

First time Sea Doo owner here and I have a very basic question. I have just purchased a pair of Sea Doo's, a 2000 GTX Millennium Edition and a 2004 GTI. Both have separate fuel and oil containers. The person I bought them from used them once last year, so knows they run, but never put fuel in...

Alright, I need some help deciding on the pro's and con's of hooking a oil pump to my new motor. I just order a new SBT 787 and have rebuilt everything in this 1996 XP. It was set up premix when the motor died and now I am thinking about hooking up a new oil pump to the motor. However I dont...