I have been following a thread in the projects forum regarding fuel gauges and thought it was kind of interesting so am starting a new one here to discuss. It seems that years ago a fuel gauge in an automobile had a float in the fuel tank that moved a wiper on a wire wound resistor. The other end connected directly to the fuel gauge which was basicially a current meter. These older gauges were susceptible to movement caused by fuel sloshing in the tank although there were measurse to damp needle oscillation, it would never completely go away. In modern vehicles, the output from the variable resistor in the tank goes to the ECU (computer) The ECU looks at the input and calculates the what the actual level in the tank is. The ECU then sends the proper number of pulses to the stepper motor gauge. I have noticed that the gauge in my 2007 car is rock steady, doesn't matter if I am accelerating, stopping or rounding a curve. Even the once simple fuel gauge is computerized today.