My speedo is over reading as in if I'm doing 30mph speedo is showing 50mph if I'm doing 60-70 clock says over 100mph at no time does it read correct at any speed?? Do I need new clocks? Any help would be appreciated

Have no idea why it should be, but it's almost as if your speedo is using the needle to show kilometres per hour rather than mph?

 

Some VCDS setting somewhere?