I found it. It was under the steering wheel.
Just wanted to share with everyone that I did not have to remove
anything to get to it. If you look under the steering column and follow
the linkage cable for the gear shifter, it will lead you to a linkage
arm and if you keep following it it will lead you to the thumbwheel. I
don't know why the Chilton's book says you need to take a lot of stuff
off, but you will need a flashlight and a flexible neck to get to it.