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I've done a couple comp. tests and find that I sometimes need to crank the engine 10+ times until the needle stops moving. Being a bit OCD about actually seeing what's happening on the gauge while I am in the driver's seat cranking the engine; I set up a camera to record the gauge while doing turning the engine. Then, I review the footage. Mainly do this because I found the pressure was dropping a little due to some leakage, but like the almight @Duece McCracken AKA DMC, says, it's a PITA if you get the adapter in there too tight. Likely will tear the little rubber O-ring that seals it if you do... Don't ask how I know this, but just words to the wise

Yeah I generally just crank until the needle stops, or about. Never had any issues, just need to keep a charger on the battery.

 

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Charger on the battery?

Yeah so you don't kill the battery from all the cranking and also gives you more consistent numbers. As the battery drains it will lower compression numbers.

 

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Ah damn, I don't have anything to charge my battery except a halo which is used for jump starting the car... I guess I can use that? not sure

Yeah that Halo would work well enough.