Had you considered googling

digital panel meter lcd

and noticed that you get a little over a million hits? You need one that
advertises "common ground" in their specifications. Most of the ones I just
looked at are in the $12 range.

Trumeter, the folks who built that little meter, are no longer in the dpm
biz.

Jim

"dodger" wrote in message
oups.com...
I'm attempting to build the RST Digital Engine Monitor (Kitplanes Feb.
2002). I could not find the LCD panel meter specified in the plans or
even the substitute mentioned in the addendum (http://www.rst-engr.com/
kitplanes/KP0202/KP0202.htm) so I tried to substitute one I found at
All Electronics (PM_200). I can get the circuit to work ok except I
need to power the panel meter with a separate 9 v. battery. Whenever I
try and hook it into the common dc circuit it goes into error mode.
Apparently, it needs an isolated power supply. Do you have any idea if
there is a way around this? It would be such a pain to have to
periodically change batteries behind the dash, not to mention it would
undoubtedly go out at the most in opportune moment.

Thanks,
Roger