[freeo75]

Have you had an escort that was ever accurate anyway????

Also there's the two different speedo gauges - the one that reads up to 200km/hr and the ones for 220km/hr. The latter is for lower gearing in the 2L (i.e. the 3.54 ratio diff). Changing to the 220km/hr speedo gauge will be more accurate if you decide to run over profile.

Then there's always an aftermarket speedo or your phone, pretty simple and cheap conversions these days
Geoff