Speedometer question

["Mick T" <mickth@hotmail.com>]

Hello all,
  Today on the way to work, my 67.5 1600 speedometer started flaking out. It 
got real jumpy, then fell to the 0 MPH spot for a few miles. Then, it got 
jumpy again. Is this a symptom of needing the cable replaced? Or am I 
looking at a Speedometer repair/replacement? How do I go about 
troubleshooting this?

-Mick-
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