The speedo is powered through a mechanical linkage from the tranmission.
It it typical for the speedo cable to fail. Check to see if the cable is not
loose on both ends. The instrument cluster end is very hard to detach and
reattach, and messing with this end will reward you with an excruciating job of
getting the end to connect back into the back of the instrument cluster. The
other end snakes through the firewall, down under the car, and to the back end of
the transmission. Make sure this connection is not loose.
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