Hello Todd,
This little jewel of a voltmeter is made by:

I4C Products
6924 E. 92nd
Tulsa, OK 74133-5318
Tel 918-492-9435 Fax 918-492-9375
www.i4cproducts.com

I believe you should plug one of these voltmeters into any open port on your receiver (use a Y connector if all ports are full), also after an experience at our Jet Rally, (trouble shooting a turbine problem) I think we should have one of these wired into the ECU battery supply circuit. With these two indicators visible just before hatch lock down and flight they will add an extra layer of protection for battery related failures.
Lee H. DeMary
AMA 36099

PS Yes, trust your eyes, I did get the I4C screwed around sorry. I first posted IC4 I have since corrected my posts. The correct company name is I4C Products. If you can't find one of these at your local hobby shop, and want to support a hobby shop (and a good one) which has these in stock contact Jim or Carol @ Things with Wings 6268 W. 10th St. #2 Greeley, Colorado 80634 970-352-1067 Jim has them in stock!! They come wired for JR, Futaba, Airtronics, Hitec, AirtronicsZ. If the plug type you want is not in stock the Futaba style plug can easily be trimmed to fit perfect into JR.

Note, PiC below shows one only I4C, going to add a second for the ECU circuit. It's the small rectangle full screen display (green-ish screen color) voltmeter located just above my wheel brake pressure gage / air tank----------