I decided that I wanted to know the state of the charging circuit but did not want to clutter it with a gauge. Today at a BMW rally in New York I found and purchased this discrete little gadget. I think it will suffice to let me know if I have too many accessories running simultaneously without cluttering the bike with a voltmeter...
Clearwater Voltage Sentry (CVS) Battery Monitoring Device
Clearwater Voltage Sentry (CVS) Battery Monitoring Device