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Well, yes investing in a quality compression gage is a must. But even quality equipment fails sometimes. The other issue is the location of the schrader/bleed valve. Many of the outboards you will work on have relatively small combustion chambers/displacement. So, even a quality gage that has a schrader/bleed valve up at the top of the gage hose will show lower than actual readings on these small outboards. Try to find a decent gage that has the schrader/bleed valve built into the threaded piece at the bottom of the gage hose….
Noting readings on good/worn engines is a great idea also for future projects, only because OMC has never really posted any compression reading charts…