Start by changing the pull-up resistor. 56kΩ is far too high for a 110Ω sender. Try a 100Ω resistor instead, this will significantly improve your voltage resolution. Also, take a look at this topic: Calibrating fuel level
Start by changing the pull-up resistor. 56kΩ is far too high for a 110Ω sender. Try a 100Ω resistor instead, this will significantly improve your voltage resolution. Also, take a look at this topic: Calibrating fuel level