Problems with fuel guage. With 10 litres of fuel in tank the guage flickers when you shake the car.I have cleaned the sender unit and it reads 22 ohm to 53 ohm depending on position of float is this ok? The guage its self when has 12 volts connected and no signal from the tank reads 3.2volts on the spade pin that goes to the tank. Is this OK? What voltage and ohms should be normal for these fuel guages? Any help greatly appeciated.