89 old ciera cross ref.

It is mounted to the base of the steering column. there are two small screws that secure both the switch and the ignition switch. Just remove the necessary screws and the old switch being careful to not let the rod fall out of the steering column- tape the rod in place. put in the new switch and replace the screws. here is a diagram of your column:
https://drive.google.com/file/d/1ah2LozuwGzsTCQoOYJbqO-q1GDPOzmYE/view?usp=sharing

you can use 1995 to 1996 buick century and olds ciera . But the ignition key has a chip in it you will need to take the Theft/Locking, (keyless entry, pkg deck)

We do not have this cross reference book that shows this info, I do know that the 3.3 was an OLDS only engine design.

You need to test your mechanical ignition switch located on top of the steering column by your feet. Remove bottom panel below steering column then 2 or 4 nuts holding column to dash. Lower steering column - the rectangular component with the metal rod going in the back side ( goes toward the steering wheel ) is the mechanical ignition switch. Disconnect and inspect harness for corrosion and dirty contacts.If the contacts are clean ( not green, white, or burnt) then look closely at the mounting screws to see if there are marks from where they were originally mounted - it is possible the switch moved away from the steering wheel which would keep that metal bar from activating the start circuit. If the switch moved, loosen mount screws and move switch back to original spot. If the switch didn't move then you can try starting the car with the key and moving that metal arm manually, pushing it toward the engine to activate start circuit. The switch MUST be mounted to the steering column for the circuit to be open ( complete) as the ground is supplied through the mount screws. If this still doesn't work then replace the switch.
Good luck!!

On 95 Ceira it is located on C clip behind the ash tray on the right side of the ashtray bracketing

3 speed - th125c / 3t40

4 speed - 4404t4 / 4t60

I just replaced the turn signal flasher today in my 1996 Olds Ciera. It was not near the steering column. It's actually behind the fuse box in the glove box but the easiest way to get to it is to remove the ashtray/cigarette lighter and it's harness and reach back to the right behind the fuse box. It took all of 10 minutes to replace. This is not the same as the hazard flasher, just the turn signal one.

DRIVER SIDE, UNDER DASH, MOUNTED ON PASSENGER SIDE OF STEERING COLUMN on a clip

This switch is mounted in you steering column where the signal stalk meets the column

the flasher is located on on the right side of the steering column. To get to it take off the ash tray and you can just see it.