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the LACK of LUBE or Graphte on the speed0 cable IF it's not an electric sending unit type. The speedo cable spins inside another cable. Moisture will cause rust after a few years and this will cause the speedo cable to start to drag and release. If you remove the cable from the back of the instrument cluster and squirt in some graphite, this should help with the bouncing.

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โˆ™ 2004-10-10 15:09:05
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Q: What would cause a speedometer to start bouncing at 20 -25 mph?
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