There is some plugs around the oil filter housing. You would need the manual to see ,which plug did what. Theres 4 of them feed and return from both oil pumps. Personally I would build a seperate oil system for the turbo.
I looked into this more due to a project , I am working on and I would tap into the second pump.This basically controls the amount of oil in the motor and has a filter screen inside the motor. This pump is mainly used for cooling but has no pressure relief valve and is about 3 times the volume capacity of the first pump that lubes the motor (Crank,tranny and other things). If youre gunna fit a turbo ,I would put a oil cooler in also.