I have a Harbor Freight(Cen-tech?) DMM with both tach and dwell. The tach is via an inductive clip-on to the HT lead(similar to what you see on a timing light).
With that said, I prefer the old analog tach-dwells. Among other things, I find it easier to see the RPM "blip and settle" when the piston is lifted on a properly tuned SU. I had a nice old Sun that was in a toolbox that was stolen last year...I need to find another. The old tachs, of course, clip directly onto the LT side of the coil.
And, yes, I run points in both my MG and Marina. One of the things I may do in lock-down is clean up and rebuild(as best as I can) an old crusty Lucas 25D4 to fit to the Marina, as it has the correct but IMO inferior 45D4. The spare 25D4 I have is the good pre-smog MGB one, which has a much more pleasant for around town driving advance curve than the super aggressive late ones.