Maybe I should explain some more....
The rectifier went last summer and took the clocks out (speedo and tacho stopped working). Honda dealer fitted new battery, rectifier, checked the charging etc and gave it a clean bill of health apart from the clocks. It runs and rides fine apart from speedo / tacho. Now, new clocks are ?840, so I managed to get a set off same year bike off ebay. They look identical, have the FI warning light same as mine, and bolted right on. HOWEVER....
After fitting the 'new' clocks, I fired her up, but the speedo is reading 20mph before you set off, and the tacho 3000rpm at tickover. When I ride it, the speedo and tacho work OK and move upwards, but they are obviously over reading by 20mph and 2000prm.
Any ideas???