Cheers Guys
The speedo uses the shell and needle of the original.
The speedo utilises an Arduino Nano, Small LCD, and a Easydriver stepper motor board, driving a Switec X27 168 motor.
Latest code and info here:
https://github.com/TJH1981/Digital-Speedometer.
The Code needs improving as if you loose power when it is not at zero it will not return to zero on re-start. It is also a bit noisy with the motor directly mounted to the metal face.