How do you replace the ignition tumbler on a 1985 Oldsmobile 98?

To replace the ignition tumbler on a 1985 Oldsmobile 98, first disconnect the battery to ensure safety. Remove the steering column cover by unscrewing the screws securing it. Insert the key into the ignition and turn it to the "Run" position, then locate and press the release pin on the tumbler; you can then pull out the old tumbler. Finally, insert the new tumbler into the ignition switch, ensuring it clicks into place, and reassemble the steering column cover.