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I'm a huge fan of the PakTrakr gauge because it gives you a whole pile of gauge options including a bar graph showing the voltage of each battery so you can see the voltage sag as you increase the load, the gauge will also give you warnings telling you what the gauge thinks is wrong if a single battery is really acting up, if it's acting like it's low on water, over charging, or over discharging so you don't have to stair at the gauge all of the time.
However after you trouble shoot your batteries a gauge like that then works as a state of charge and a amp or kw meter, or what ever combo of gauges you want.
Most of the other gauges I've seen are either home built or costs $1,000 or more.
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