2005 SUZUKI C90 Electrical System Instrument Clusterpanel Problems

I HAVE A SUZUKI MOTORCYCLE IT'S 2005 C-50 BOULEVARD NOT A C-90 AS THAT IS THE ONLY SELECTION IN THE NEXT MENU. THE SPEEDOMETER IS OFF BY 6-8 MILES AN HOUR IN THE PLUS SIDE SO WHEN I THINK I'M DOING 60 I'M DOING 53-54. I HAVE CHECKED THE SPEED WITH ANOTHER VEHICLE AND A GPS. I HAVE BEEN TOLD IT IS AN UNCORRECTABLE PROBLEM BY THE SUZUKI CORP. THEY CLAIM ALL THEIR BIKES ARE OFF 8-10% INTENTIONALLY FROM THE FACTORY. THIS I FEEL THIS IS AGAINST THE LAW AND IF NOT AT THE VARY LEAST A SAFETY HAZARD FOR THE RIDER AND TRAFFIC SINCE THE RIDER THINKS HE/SHE IS DOING THE SPEED LIMIT AND IN FACT IS NOT AND IN A STATE MI WHERE THE MINIMUM SPEED LIMIT IS 55 CAN GET FINED. *TR