Take care with the conversion in the planning stage.
It is easy enough to take an oil FEED to the turbo for lubricating and cooling it's bearing and shaft, but you must also arrange a free-fall oil drop tube back into the crankcase. In SOME engines there is a nice tapped hole with a plug in it on the left side of the block just for this job. If your engine was a N/A diesel, I don't think the hole is drilled and tapped, so you would have to do that. At the very least you would need to take off the sump to be able to catch the drill swarf. Funnily enough, my 2.5 petrol engine had the hole drilled and tapped and plugged!
Fitting a turbo to a N/A without also fitting the fuel injection pump for a turbo engine will not raise the performance much, if any. It might do a mile a gallon more on fuel, but that would be all you could expect.
Is it worth the effort?
CharlesY