Citroen_Pug. ?? reset an Electro Mechanical Odometer to Zero

[Stickyfinger]

Does anybody know if/how to reset an Electro Mechanical Odometer to Zero ?

I have to change my KMPH Speedo (at present only the face is changed to fool the MOT man) to a MPH one.
I have sourced the correct V6 type in MPH but I would like to reset that to either zero or to the correct KM/MPH. I will naturally inform DVLA of this act. It would be nice to zero it. The unit is standard PSA/Citroen/Pug 1997 issue

[Stickyfinger]

All done. There is a key wheel (thin) next to the first wheel, flip the shaft up, line up the key wheel then the other numbers with the key wheel and you have a corrected speedo.

[Stickyfinger]

Dave Brand said:

Had to be one of those jobs that's either amazingly simple or almost impossible!

Yep , one where you wonder why you wondered how.