Try turning it over by hand. On my 1985 300D, there is a bolt on the p.s. pump which makes that easier than the crank bolt. If you feel each cylinder resist you strongly, over 2 revolutions, you probably have good compression.

Did you crack each tube nut at the injectors and crank until you saw liquid from each? If not, there may be air in the tubes which allows the IP to just bounce against it without building enough pressure to pop the injector and purge the air. I don't think that is easy on your engine, with the intake manifold over them.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans