sumplug
Established member
Lets end this and tell you how the garage way is. There is a "dry" and "wet" test. Dry is done at beginning with open throttle and pressure guage. When readings have been done, you put a small teaspoon of oil down each plug hole to do a wet test. This is to test for ring failure. If the guage does not read higher, rings/gasket is leaking. Simple and takes 15 mins to test for compression/leaks.
Andy.
Andy.