How to replace speedometer 1969 El Camino?

To replace the speedometer in a 1969 El Camino, first disconnect the battery to ensure safety. Remove the dashboard trim and unscrew the instrument cluster to access the speedometer. Disconnect the speedometer cable and any electrical connections, then take out the old speedometer and install the new one by reversing the steps. Finally, reassemble the dashboard, reconnect the battery, and test the new speedometer for proper function.