Our group Jodel has a chronometric tacho but as far as I can tell, it will indicate any rpm value. However, because it seems to work on a sampling basis, any rpm changes take a few samples to stablise, i.e there is always a delay before the new reading is shown. In fact most of the instruments are quaint in this (french) aircraft, the ASI reads in km/h, and I've never worked out what french units the oil pressure reads in. Fortunately the gauge has red, amber and green sectors and I can cope with them.
Still, it gives the aircraft a lot of character, and we have the original black-crackle instrument panel and original vertical throttle levers.