Speedo Problem

[ukracer]

Hi,

Does anybody know of an outfit in the Grimsby, Lincoln, Leeds area who can calibrate a speedo? Recently my diff dropped on the Marcos and smashed the sensor on the prop shaft, that has been replaced and kinda set correctly, but the speedo reads 15pmh slow! I guess it needs measuring to the 3mm gap and set on a rolling road. I have tried searching the web and not had any luck.

Bob