I am helping a friend build a kitcar and we were thinking of using a speedometer from a different car to the donor.
I have taken apart the donor car’s speedometer and odometer and worked out that the total reduction is 1600 turns of the cable to 1 mile on the odometer. The car is French, and working on 1.6 km to the mile, the native kilometres only unit would be geared 1000 to one. A nice round number.
I seem to remember reading that all smiths (British) speedos worked on 1000 turns to the mile.
Is this ratio of 1600:1 standard for all European speedos?
If so, swopping should be easy. If not I could take the innards out of the old speedo and fit it into another one. I know that the needle moves 36 degrees per 10mph and I could print a different scale, but if there’s an easier way…