Note, don't put in vice repository a "derived" test (i.e. copied). Just put my program.
Another note: it's totally useless to use both VIA timers. Considering the speed range of VICE, the difference between 275 RPM and 325 is 33566.4 cycles which is fine because it's smaller than the 65536 cycles the timer can give us.
The question still is: by doing that, do we gain accurracy over the free running timer? Like Zibri said, we know already we will measure something close to 200000 cycles, and we dont have to be able to measure arbitrary times.
Z_M X Z_N -> Z_N; (m, n) |-> n-m