The speedo isn't working on my xr3i.i have took my clocks out and they seem fine,I have checked the speedo cable and the spindle inside doesn't move when I drive the car.someone has said it could be the sensor in the gearbox? If it is that how hard is it to change?

Thanks

 

Speedo drive (red cog drive can be got off ebay for £12~)
Usually caused by worn diff bearings in the BC gearboxes.

Takes 10mins to swap over