replace the fuel float inside the gas tank.
Test gauge function with a mechanical gauge to get actual engine temp.
The fuel sensor is in the gas tank and probably needs replaced, the tank will have to come out to fix it.
The thermostat is stuck open and needs to be replaced.
The problem is most likely the sending unit, not the gauge itself. The sending unit would have to be replaced.
Thermostat is sticking.
Sounds like a wiring or sender unit problem. Ground wire at sender unit, see if it stays steady. If it still jumps around, wiring/gauge problem. If it stays steady, sender unit should be replaced. Good idea to do an oil pressure test as well.
The gauge, wiring or sending unit is bad.
More than Likely its a coroded connector at the sensor.
Try resetting the computer
i have a 1990 ford ranger and my fule gauge always reads full, why?
The floater inside your pump is sticking. You will have to replace your fuel pump in order to fix this problem.
no