You need a Oil Feed Line and a Oil Return Line.
Purpose is, so the turbo can be properly lubricated and the bearings will maintain a certain temperature window, a.k.a. oil cooled/lubed bearings.
The return line is so the oil can return to teh oil pan and then repeat the cycle again.
You can get a Oil Filter Sandwich plate from Golden Eagle or a few other companies to give you a Feed point. They work exceptionally well.