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Should the compression reading be tested wet or dry?

I do have the air intake off, no filter, I have a 22 mm diesel compression kit, I removed the injectors and tested there, I did a dry test and a wet test, wet was great, dry no so good. Wet was 425 on all three, dry test was 240 on one 70 on the other two.

I have a Kubota B6100, great tractor, i never had a problem. i drove up to the house in late summer, shut it off like normal. came out the next day it wont start. replaced the fuel filter, glow plugs, injectors. and it still wouldn't start. checked compression, all three cylinder above 400...