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Hi
This migt be a vire that is shorted or it can be dirt on the tanktopp that is shorting the curent to ground, ofcourse it can be the instrument or the tank unit that is failing.
Bjarne
If the meter shows "more than full" it is probably wiring fault. If it shows just "normal full" it might be the linkage to the variable resistor inside the tank that is the problem. This experience do not come from a Zetor but a MF tractor and might be to some help.
Hazze