"Ken Heaton" wrote in
news:zSqse.76368$tt5.39986@edtnps90:

I think it simply doesn't count running hours until it see RPM's on the
Tach. No RPM's (probably under a threshold of 100 RPM or so), no hours
counted.


That's it. If it displays RPM, it runs the little clock.

We used TinyTachs on jetskis because of the crappy dream-o-meters jetski
companies put in them to make you feel wonderful....30-40% over reality.

I even saw one on a GoPed!...(c;

By the way, you don't have to provide it power. It will run a whole year
on a 9V alkaline battery.... That reduces the wiring to one wire and
ground....on the diesel. In a gas engine, there's no wiring at all! You
simply wrap the little wire coming out of it around any convenient spark
plug wire and it detects the pulses firing the plug by capacitive coupling
to the open-ended wire. You then select 2-stroke or 4-stroke to tell it
whether to count every pulse or every other pulse.

--
Larry

You know you've had a rough night when you wake up and your outlined in
chalk.