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If it is a cable driven system, usually a jerky needle is caused by a dry cable, either replace or lube the cable as it is getting stuck and stopping for a second then getting unstuck and jumping back to current speed. If it is an electronic speedo then it could be a loose connection under the car, usually they tie into the transmission to get speed input. Or could be as worse as a faulty speedo in the dash.

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Q: What would caused the speedometer to go crazy and jump all over the place?
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