Mike.

You can get a Diesel compression tester with all the common adaptors from Harbor Freight for less than $150. You can get an old glow plug, cut it off just above the threads, thread it to accept either a 3/8 in. npt pipe thread or braze on a hydraulic hose adaptor and put the gauge on the end of the hose. Add a 500 or 1,000 psi gauge and Bob's your uncle.

You can use starting fluid on a Diesel as long as you don't operate the glow plugs.