My belief is that this problem is caused by the difference in the sizing of todays tires. EVERY early 60's Imperial I've ever owned showed roughly 15mph over the correct speed when cruising at highway speed. John bevacqua wrote: > I have a problem with my speedometer in my '59 Imperial. At 30mph, it's > okay. At 50, it registers 65 mph!! Obviously, the jewel/s is worn. Who > does this type of work IN A TIMELY MANNER?? Does anyone have a KNOWN good > one for sale or to use, in case it takes a while to get mine repaired?? > I appreciate your help. Thank you. > > Tony >