"Garland Gray II" wrote in
news:NF7Se.106075$Ep.86997@lakeread02:

You have mentioned Tiny Tach before , Larry. They seem pretty
impressive, and now the diesel model.
Are they very accurate?



Digital....it's a pulse counter. It's as accurate as your quarts
wris****ch.

The first model was created for toy engines....jetskis, snow mobiles,
motorcycles, etc. I had one I transferred from jetski to jetski. It
didn't even connect to the engine! You wrapped its little antenna wire
around a spark plug wire and told it how many cylinders your engine had.
It picked up the pulses by capacitive coupling. Those had watch batteries
in them I don't ever remember replacing. The diesel models must have to
use a little more power, hence the 9V or DC power connection.

--
Larry