Speedometer Assy

The only answer to a worn out, damaged or missing instrument, unless you possess the skills of a watchmaker and electronics engineer, is to renew the assembly.
These are virtually impossible to repair, unless you have the aforementioned specialist skills, and renewal with this superb quality OEM replacement is the only realistic option.
Check this out: 37100MZ2601.

Alternative and related meter components you may wish to consider:

37601MY3781
37600MZ2610
37600MZ2611
37600MZ2671
37600MZ2A11
37600MZ2A20
37600MZ2A21
37250MZ2610
37250MZ2611
64570MZ2000ZA
37250MZ2650
37250MZ2651
37250MZ2671
37200MZ2600
37200MZ2610
37200MZ2611
37200MZ2670
37200MZ2671
37200MZ2720
37200MZ2721
37200MZ2A20
37200MZ2A21
37110MZ2000
37110MZ2003
37100MZ2600
37100MZ2601
37100MZ2610
37100MZ2611
37100MZ2650
37100MZ2651
37100MZ2671
37100MZ2721
37100MZ2A11
37100MZ2A20

Repairing instruments and their casings, cowlings and lenses is somewhat specialised, if you do not have that skill set, then replacement is easier.

Add as many parts as you wish to the same shopping cart, new anti-vibe rubber 37244MB2008 and new speedo cable 44830GC8000 for example, and still only pay the same single fixed price shipping cost.