We always used to rely on float gauges to monitor water use and engine hours to monitor fuel use when cruising. In our experience water float gauges were pretty useless so then we got thinking about using in-line meters. We tracked one down in the USA which measured use in litres, didn 't require a power supply, could be reset when the tanks are filled and can be read remotely. It has been brilliant. I now know exactly how much water we have used and what we have left. I can thoroughly recommend fitting on and we are thinking of adding on to our fuel line too. I am sure there are many on the market but the one we use is shown below.


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