Hmm, it seems like all the fuel gauges I can find are designed to be incorporated in to a bms, instead of being added to the input/output of an already existing

Hmm, it seems like all the fuel gauges I can find are designed to be incorporated in to a bms, instead of being added to the input/output of an already existing bms. Do you know if there's a fuel gauge that can work with 12v so I can just add it to the circuit I'm using?