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Tinman, there are commercially available pressure testers and many use them. Stevens instrument makes an excellent pressure tester as well as a vacuum tester. Some have adapted radiator pressure testers to work with gearcases with good results. Some of us use home made testers. Mine is a tester I made myself in my shop. It uses a 0-15psi gauge, a Schrader valve, and a machined aluminum body that screws into and seals against the drain plug hole. Testing is normally done between 6 and 10psi. Below is a link to a video I recently made in a series showing the tune up of a 1959 Evinrude Fastwin. I hope this helps.
-Ben
OldJohnnyRude on YouTube