I seem to remember something on the old forum about a voltage input/output so battery status could be viewed. The unit I remember was 6 battery unit named B-6 ? I have 2009 with 9 eight volt gel batteries. Is there a unit for 9 eight volt batteries.
May be something better if this is in your bubget.
I have a Dash mounted Battery gauge, it’s for a flooded lead acid pack. I bought it from Quick Charge when I bought my charger
Let me know if your intrested
Let me see if unit will do what I want, then will get back with you. It may be few days, in the middle of project. Thanks