I don't beleive you have to remove the dash to change the switch, reach up behind the dash and get your hands on the switch itself. There should be a spring loaded button on the exterior of the switch, once you locate it push the button down and pull the switch handle out, it should come right out of the switch assy. Remove the lock nut and the drop the switch down where you can see it and unplug the harness. Reverse the procedure for the install. Don't remember if I ever changed a 67 but the earlier Fords had this set up.