If you have a 1966 Thunderbird that came with a C-6, the data plate on the door should show code 4. If that is the case, it once had a switch on the treansmission which may have been removed. If there is no switch there, you can put one there, but I would first check to see if the wiring is present. The switch on the steering column would be only for park brake release. Let me know if I can help further.
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