Speedometer calibration

[midyearroadster427]

can someone recalibrate a midyear speedometer themselves?????? Has anyone done it, besides the professionals I mean?

 

[magicv8]

The speedo may not need to be recalibrated if it is in error by the same percentage at all speeds - in that case a simple change of plastic speedometer cable driven gear may do it - if not a not so simple change of both the driven gear and the trans drive gear will do it.

If the percent error varies with speed, IMO it will need to be serviced.