I just found a really nice panel volt meter. It is
7/8' X 1-3/4' X 1/8'. Weighs nothing. It needs a
single 7/32' hole for mounting. The wires run through
the single hollow mounting stud to the rear of the
panel. Really slick! 2 wires (+V & ground). Reads
4V to 25V. It's from Lascar Electronics. Model #
EMV-1200. Cost is $25.00

They also have a hobbs (hour) meter. Same size & price.
Reads either total time or trip time. Could be useful
for keeping track of flight times.

www.lascarelectronics.com

Bob C.