I would like to know the voltage of my auxiliary battery at any given
time and I am thinking of possibly installing a VDO Cockpit voltmeter
somewhere in the cabin area. Would this work, or would the meter itself
be a drain on the battery?  Perhaps if the voltmeter is wired with a
switch?

How about a VDO Cockpit clock? Same question, but a switch, of course
would not work.

Any suggestions?

Thanks

Ralph