23-08-2022, 09:28 PM
Many years ago I had a speedo recalibrated by Speedy Cables, I've no idea how it was done but all the modification was internal and perfectly accurate. It's still spot on 30000 miles later and I also remember it being very reasonably priced at the time. Maybe I was just lucky with the available parts but it would seem preferable to having an external gearbox.