Yep! Was just hoping somebody might already know what voltage the readouts correlated to. If we end up figuring it out using your tips on measuring voltage from the cigarette type outlet we'll post it here!Michigan_Mike said:From the looks of the photo you just press on the respective button designated for Gray - Black - Fresh Water tanks and the display to the left will let you know whether it is 25% - 50% - 75% or 100% full or empty. The same would apply for the battery, but without actually knowing the voltage output that will be a guess. that's why I recommend a simple 12V LED meter or consider having a more sophisticated set-up like the Trimetric voltage monitoring system. We do have members who use the Trimetric set-up.