Bob Noel writes:

Also, the P1000 will annunciate
a bad mag, which the R-1 does not.

I highly recommend having this feature and its relative, "mag drop".
It would be a shame to switch to an electronic tach without getting
such basic features as a result.

In fairness to the R-1, it does have the "mag drop" feature.

O.k., I'm stumped. How can it tell you that it's measuring mag drop
without telling you that one of the mags isn't firing?

--kyler