Ok, i did a little research on drawing oil from behind the filter versus the oil pressure sending unit.
I remembered that is where i wanted to put it, but couldn't remember why....hehe
Ok, by using the bung behind the oil filter, that's almost the closest you can get to the oil pump as far as predrilled positions, and the oil from this port comes almost directly from the oil cooler, and directly from the filter.
So your getting the cleanest, coolest oil you can get from the crankcase for the turbo. Versus pulling it from the oil position sensor bung, which that oil has been almost completely thru the engine, and the temperature of that oil is the same as the block.
Not to mention, the oil pressure sensor bung will have to be drilled and tapped due to it being a smaller diameter