How do you change the speedometer cable on a 89 Oldsmobile calais?

To change the speedometer cable on a 1989 Oldsmobile Calais, first, disconnect the negative battery terminal for safety. Then, remove the instrument cluster by unscrewing the necessary fasteners and pulling it out gently. Disconnect the old speedometer cable from both the transmission and the back of the speedometer, then replace it with the new cable, ensuring it is securely connected at both ends. Finally, reassemble the instrument cluster and reconnect the battery.