same procedure, remove the injectors, injector pipes, disable the injection pump and install your tester, make sure other injectors are out to ease the load on the starter, test the compression.
Some adapters are available to test the compression from the glow plug ports.
A wet test is never done as the engine will try to start on the oil you put in there - oil will burn as fuel. The compression measured in a 23:1 compression engine is about 500 psi.