You could be right at the end of it's service life. No cable driven speedometer will last for over 1/2 a century. At some point it will lock up. typically this happens when you are on the freeway. Given the RPM on the cable, for example at 60 MPH on the dial, the cable is in rotation at 1,000 RPM.
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Peter Serio
Owner, Precision Pontiac
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