Hi Jim. As I stated they are deep cycle and discharge to much lower voltages. We have already run them down regularly to 6V a piece, which although not a problem for the batteries, is a problem for us, which is why we are trying to make the gauge to monitor them. Its not pleasant to see the whole thing shut off for no reason to find it was something as simple as low batteries...
edit: also, I would rather just have help with the circuitry for what I asked than debate what kind of batteries I have. I don't mean to seem rude but its kinda off topic.
edit number 2: also, if you notice, i keep saying we... this is on a team, and i am not one of the powers to be... although i agree that they shouldnt be run down that far and have voiced my concerns to them, im not in a decision making position... that being said, they asked for a 12-24V gauge and thats all, so that all i am making...