The most common causes of erratic pointer movement are:
- Bad ground. Make sure the ground connection on the gauge is connected to the same spot as the car battery ground to ensure you have a good ground. Do the same for the sensor (the gauge and the sensor need to have a good common ground).
- Externail noise. Noise introduced from routing the signal wire close to a high voltage electric source (i.e. spark plug wire, ignition). Make sure your signal wire isn't picking up any noise.
- Bad or incorrectly installed sender. Ensure your sender is operating correctly and it producing a good signal.
If you are still seeing some noise after checking the above items, try adding a 0.05uF (micro Farad) or 0.1uF capacitor across the input to ground. If signal noise is the issue, this will help filter out any signal noise and smooth pointer response.
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