I'm not sure I would personally find it all that useful. This is one area where I think the little KIB light panel is somewhat useful....the little 1/3, 2/3 lights that show the battery and tank levels. Just a quick dirt simple way to tell if the house battery is nearly full or not. For the chassis battery.... in 35 years of driving I've never really found that I need to know the exact voltage to the single digit or tenth....
well you know, as I type this and think it through a bit more, I'm almost inclined to change my answer. A simple dual display might have helped me to see that my BIRD relay had failed before the dead house battery clued me into it.
__________________
|