Which compression gauge adapter?

[F20Daniel]

I plan to purchase a compression gauge for my diesel VWs, but figured I should also get an adapter that will work with my Yanmar F20D. Not that I'm having any problem, my yannie is running just great.

Can anyone tell me which adapter I should get?

Snap-on sells several.
One for: John Deere 404, 466, 531, and 619
Another for: John Deere early 300, 400, and 500 Series
Would either of these work?

I suppose the answer to what injectors fit would also answer this question.

Thanks, Daniel