How do you install a speedometer cable on 1991 mercury topaz gs?

To install a speedometer cable on a 1991 Mercury Topaz GS, first, disconnect the negative battery terminal to ensure safety. Then, remove the dashboard panel to access the speedometer. Disconnect the old cable from the speedometer and transmission, then install the new cable by connecting it to both ends securely. Finally, reassemble the dashboard and reconnect the battery, ensuring everything is functioning properly.