I used an oil pressure switch teed into the line to the oil pressure
gauge. When you turn on the master it puts power to one side of the
switch and once there's pressure it closes the switch and sends power
to the hourmeter.

Ok!!! it's really a DATCON #102033. The meter records time. It runs from
battery power. I would like to wire it in some way so that it only operates
when the engine is running. As it is now, the only thing I can figure to do
is wire it to the master so that when it is on, the meter runs. This will
not provide an accurate engine or airframe time, therefore, I would like to
have it only run when the engine is running. Does anyone have any ideas?

Charlie
"ccwillwerth" wrote in message
.. .
Hi, I would like to wire my hobbs so that it only runs when the engine is
running. Is there an oil pressure switch or something that could be used?

Charlie