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For your 89 with manual transmission it should take a couple of
minutes to remove and install a new key cylinder.

Look at the picture posted. The red arrow points to a metal pin
you push inward on to release the ignition key cylinder assembly.

Disconnect the negative battery terminal. (Don 't have to but I would).
Turn the ignition key to Run.
Look at the Hazard switch (the switch you pull out to turn on the hazard lights).
You will see a hole in the column that allows access to the pin.
Use a punch or nail and push inward on the pin and at
the same time pull the ignition key cylinder assembly from the
steering column.

Turn the new ignition key cylinder to the the run position and
push it into the steering column. The locking pin will snap
back in place.

Verify all five positions work.
Accessories
Lock
Off
Run/On
Start
Reinstall the negative battery terminal.

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