What fittings do I need to use? About the accuracy part, we all know diesel use much smaller cylinder volumes for combustion, will this effect the readings, giving me a false positive?

I have a snap on mt324, used it on my lawnmower and friends accord to see if it worked.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.