I don't have a voltage gage, I would have to measure with my meter at the batteries. Putting one like you have is probably a good idea. My monitor panel just has LED scale, and I have no real idea what the levels for battery charge represent. I guess as long as I can keep heater running, and then fire generator in morning it means it has enough.
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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