Sorry for taking so long to add images of my system in my 72 LongHorn...
This is a 402/TH400 factory with the Cruise Control added.
2 NOS Switches, showing the wiring.
Look at where the switch is installed on my dash, and the ground cable going to the steering column cover bolt.
I have a pic below of the brake pedal assignment for the Cruise switch.
The one bracket holding the brake pedal switch looks home made and/or dealer made.
I would like to see other installations from you guys to see how yours compares to mine.