For years people have been forced to mount their rotary switch through a panel on their dash or somewhere inconspicuous, but either way they were had to drill a hole somewhere, and that can never be fixed. Well with our GDP Brackets there is no more drilling! Each vehicle has an OBDII port under the dash, with screws that hold it up. Our bracket simply forms around your OBDII port and utilizes the factory screws to hold everything up together. The switch knob is then pressed through the bracket, and now you have a quick & clean install for your SOTF tuning.