So today as i was heading to pick my buddy up from school, i was entering a 55mph zone and i saw this police car sitting on the side of the road. So i kept it cool running at about 53 or so, and next thing i know the cop is following me up the street with his lights on. He told me i was really going 72 when my speedometer clearly read 55. My first question is how can i get this speedometer calibrated correctly? I've got 2.73 rear end gears. An secondly, is there any way i can prove that my speedometer is off and get out of this ticket? Any help is much appreciated :bigthumbsup.