Due to some unknown reason our boat
has no water
tank level sensor and the installation
of a rigid capacitive probe from the top of the tank is nearly impossible because the fuel tank
is stacked on top of it.
So I consider using a hydrostatic pressure sensor which I can just "throw in" and let measure on the ground of the tank.
Such sensors usually come with a 4-20 mA output and are quite expensive.
Are there any hints or recommendations?