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I have developed a kit that will help you wire a GM column to the original or an aftermarket wiring harness.
Note that it is mandatory to convert to LED bulbs when using a GM turn signal switch. The additional load of six 1157 brake light bulbs will fry the GM switch ASAP! Also, a GM switch does not provide the signal required to operate the K10 emergency signal relay on the 1967-68 Cougars, so an adapter is required.

The kit includes:
LED compatible indicator relay
6 LED bulbs
Turn signal switch connector with pins
Emergency signal adapter (not required for the latest generation sequential system controller)
Instructions with a schematic for the GM switch
 
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