I recently replaced my Steering wheel with a model from Sparco. Keeping the horn function was easy. I have to drive the car to and from race tracks, and cruise control would be a great item to have on the drive. There isn’t alot of info on how to do this but with the wiring manual I figured it out.
This is the harness for the cruise control, you can see the blue wire for the horn is already cut and spliced to make it work. This will also be the power for the cruise control buttons.
Further down the line from the steering wheel, inside the dash is where i made my splices to keep a short lead to where i was going to place the buttons for the cruise control. I placed them in the coin tray on the left side of the steering wheel.
Here is a pic of the extensions of the cruise control wires and the splice of the horn/power wire.
I cut off the coin pocket and trimmed a piece of real carbon fiber to fit the hole. After I drilled holes I added the two momentary on/off switches.
After soldering the power lead to both buttons, and one green wire to each button I sealed them up with heat wrap.
The completed project, I sealed the carbon fiber to the dash with some structural adhesive.