DNK said:
Yup, that's just the problem. TRs don't have the ports to hook those things up. I also suspect that the balance tube would make them less accurate than, say, the SU tool kit.
I did try one of the glass tube mercury types, many years ago on a motorcycle. Worked OK I guess, but I couldn't see any big advantage (so I never borrowed it again).
Besides, as long as the synchronization is kinda sorta in the ballpark, chances are you'll never notice the difference in performance. Even with one idle adjustment backed off entirely, my engine still idled well enough (bit of a lope) and drove fine.