Dakota98 .... I dont even trust it for the holding tanks. I was dry camping this past weekend and had to have my black tank pumped (me + 5 girls = full tank quick). Right after pumping the tank still read full and even my grey was reading full but that was dumped earlier. Only thing it measures right is my fresh water.
Yes, good volts equals good amps. I remember reading a post from someone that listed the volts and how they equated to amps on a battery. Was helpful for a high level view into the battery status.
I will check out the trimetric and volt minder. Thanks for the advice.