Tank tender

[brokesailor]

I have a Tank Tender thst monitors 2 freshwater tanks amd 2 fuel tanks. The fuel tank indications are both at 10 before and after i filled up. Like everyone else when i fill up potable water fill it till it overflows. Any ideas as to what to do about indicationc

[Greg4cocokai]

Broke, I've installed the same system on a couple of my boats and really like them, but they are really delicate. DONT over-pressurize them or you will damage the diaphram. Take the airline off the back of the gauge and blow back to the tank. Make sure you can hear the bubbling in the tank. Put back together and it should work. You're tank probably has dirt/algae in it. Not sure why both would read the same?? Good luck!!