Peter,
One often overlooked item is the bushing at the rear of the speedometer. Disconnect the cable from the speedometer and spray some lube on the rear of the speedometer.
As Tim points out, routing of the cable assembly can make a difference.
@ Tim,
If tightening the speedo cable at the back of the speedometer causes the speedometer to stop working, most likely the problem is that the inner cable is too long.
John
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