Just throwing this out there, but could it of been placed in KPH and not MPH. I don't even know if they can be placed in KPH. But just a thought. Sweet to be 16 and own a Challenger
Be careful and put all your effort these first years of driving to do it by the book. That way you put down a good foundation for skilled driving. All you learned to do in DE should be practiced so it becomes habit. Good luck and happy motoring.