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The speedometer and odometer are both driven by the same cable. It is not uncommon for one of them to work and the other one to not work. If either one is working your cable is good and the problem lies in the speedometer/odometer mechanism.
 

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The white crown gear on the odometer wheel is probably split and cracked from age and heat. It's a matter of inspect the speedometer and see what's broken and repair it. Not many speedometer shops left anymore so it's pretty much DIY and find spare speedometers and hope you can get good parts.
 

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Discussion Starter #5
Thank you. Speedometer works, so....

The speedometer and odometer are both driven by the same cable. It is not uncommon for one of them to work and the other one to not work. If either one is working your cable is good and the problem lies in the speedometer/odometer mechanism.
 

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Discussion Starter #6
I took down my instrument cluster, installed a new lens, and general cleaning. Reinstalled and odometer started working - either the crown gear that elcam84 noted above was crusty and stuck, or the cable was not seated all the way.

Regardless, it works.
 

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Yeah........
 
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