In the past I have always had to carry an extra 20 liters of diesel in a gerry can in case I miscalculate or lose track of the amount of fuel I have on board.
It's one asspect about the system I do like. My last boat had conventional gauges that were repeatable but the indicators were not correct. 1/2 wasn't really half but E really was Empty. Lots of guess work. Just a reading like 6 inches has a better more reliable feel to it so long as you know that it's a 30 inch tank or a 12 inch tank and how many gallons.
Not requiring anything more than an airtube is nice. What is not clear to me is how the unit on the current
boat got the way it is. The needle is bent 90 degrees counter clockwise. I have to wonder just how that could have happened. Hart has offered to fix / replace it for a reasobable price
. It is old and I'm not the original owner so it's not like they owe me anything. It is nice to know they do something just because you have one.