This is a plumbing diagram for the exact oiling system I have been using on my Z24 for about 16,000 miles.
The second diagram is the wiring schematic for the oiling system. I used a generic mini turbo timer I purchased off eBay for $25.00 to run the oil pump for about 20 seconds after the engine is shut off. This makes sure that there is no residual oil left in the return line that could leak past the turbo bearings while the car is not running. It works very well for me.
Please check the wiring instructions specific for your turbo timer. Wiring can vary a bit depending on the system.
Here is a picture of my economy turbo timer: