Long story short :
1990+ 2LT2 or 2LTE on 2L2 will work, -1989 2LT1 on 2L will work with 2 drill and taps.
You will need to work the oil feed and return out, there may or may not be a provision for the rigid feed pipe on the filter/cooler assy, for the return there will be an undrilled spot in the block casting you can drill yourself at 20mm-ish. There might be no provision for the turbo watercooling on the n/a so you might have to add a couple tees or just skip the watercooling altogether. There's no such thing as a fuel pressure regulator on a diesel, the factory turbos have a boost compensator on the injection pump which is useful but not absolutely necessary, I added about half a turn on the volume on my 2L+T with no boost compensator and the smokes stops at about 1400rpm. Without the compensator you really have to chose between low end cleanliness and high hp. You will have to rework the intake piping and make sure the head vent goes before the compressor. An upgraded radiator will be a bood idea too. Before you start on this make sure there is sufficient hood clearance for the turbo as the LJ series engines turbos are standing out a fair bit higher than the top cove. You don't want to burn the drivers ass or the underhood carpeting.
If you add a turbo you will sacrifice some engine longevity period. No matter what the EGTs might tell you, you will have a lot more cylinder temperature and pressure, and a fair bit more strain on the moving parts. By all means make sure the injectors are good, it doen't take that much to melt a piston.
