This piece is a speedometer speed adapter for mini Sportpack MPI of the year 1999. I think it should work for all models of mini 1959-2000
Due to a mechanical problem, I changed the differential and the ratio is different. I have a greater acceleration but a lower top speed! I had to change a gear on the rotating speedometer cable, engine side.
It is apparently very hard to find. I tried some without good result. My friend said it was not available. Then I measured my speed with a GPS and compared. When I was 50 km/h, the meter reading 60. The number of kilometers traveled also increased faster. I had to slow the rotating cable with a factor 1.2.
This piece, once seated behind the counter, allows a correct speed display

Print parts and test gears. smooth axes until everything goes well without jolts. I used PLA. No need support. Put a lot of grease. Close with 3 countersunk screw M3 and 3 nuts

For the tip (the little bar that goes into the counter), I had the best result with nylon. PLA broke and Bendlay was frayed. You need to slightly whittle it fits well in the gear and the meter. You can also use a metallic square profile and a file.

Put the gear housing in place and secure with the fixing. Turn the gear housing so that the rotatable cable connects straight as possible. There is enough room behind the counter.

The thing made a little noise when turning. But this is nothing compared to the (beautiful) noise of the engine!