"Jose" wrote in message
.com...
One trick an instructor showed me... cut the master switch off. The
engine keeps running... and no time logged.

Doesn't the hobbs usually bypass the master, like the clock?

Some do, some don't. As you've seen yourself, the actual installation of
the Hobbs meter varies. The most common is to hook it directly to the power
source through an oil pressure switch, but some go through the master
(either in addition or instead of), some are hooked to a gear squat switch,
some may be hooked to some airspeed sensor, or manifold pressure sensor, or
whatever.

Pete