I have a 89 s10 and the steering wheel had to be removed to do the job. I'd say your best bet would be to get a repair manual and it will go through the job step by step for u.
Remove the dash trim around the gauge cluster and radio. It helps to put the shifter in 1st to get it out. Remove the upper and lower steering column covers. Disconnect the air bag(unhook the battery first). You'll have to remove the steering wheel to gain access to one of the bolts that holds the tumbler housing to the column. I think there are 3 in total, they are torx heads. Remove those bolts and the housing will come off. If I misunderstood the question and all you want to replace is the plastic switch that is turned by the tumbler when the key is turned. You can get to that by just removing the plastic around the column. Below the key you will see the big wiring harness.(disconnect the battery) This piece can be pulled out of the bottom of the tumbler housing with a screw driver. Once it's out you will see what the tumbler actually is turning when you turn the key.
USUALLY the key and tumbler in this model is held in by a supporting pin on the front or the back of the key and tumbler. Push the pin in with a small screwdriver or an awl. the pull it out. Put the new key and tumbler in the same way push it in until the pin locks in place then turn the key to see if it works. If it works you are finished!!
Remove the plastic 2 piece shroud around steering column so as to gain access to the housing the tumbler sits in. Find three Phillips screws to remove in holes in the lower piece. Turn the ignition key to the Run position. Insert a small tip screwdriver in the access hole on the bottom of the housing to push the spring-loaded tab which will free the tumbler so you can simply pull the tumbler out with the key. Installation is the reverse. Be sure tumbler with key inserted is set to the Run position. Depress spring-loaded tab, insert tumbler into housing hole with tab down. All the way in, turn key to the Lock (off position).
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