How do you replace ignition switch in 1974 Mercedes 450?

To replace the ignition switch in a 1974 Mercedes 450, first disconnect the battery to ensure safety. Remove the steering column covers to access the ignition switch, then detach the wiring harness and unscrew the switch from its mounting. Install the new ignition switch by securing it in place, reconnecting the wiring harness, and reassembling the steering column covers. Finally, reconnect the battery and test the new switch to ensure it operates correctly.