I am working on a 1973 pantera. On the wiring diagram right of the steering column it says an orange wire and yellow/black wire that goes to 'controls illumination regulator" I think this is for the rheostat switch. Then left of the steering column there is another orange wire and yellow/black wire that says to 'instrument illumination regulator". I don't understand where this second connection goes to and why. Thanks for you help. Rich Hoppe I am working on a 1973 pantera. On the wiring diagram right of the steering column it says an orange wire and yellow/black wire that goes to 'controls illumination regulator" I think this is for the rheostat switch. Then left of the steering column there is another orange wire and yellow/black wire that says to 'instrument illumination regulator". I don't understand where this second connection goes to and why. Thanks for you help. Rich Hoppe