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The only reason I know about how the speedometer works is because I did design work on a damper mechanism for an inclinometer that's based on the same principal.

Quite a number of cable drive gauges have hydraulically dampened needles, generally tachometers. Of course I learned about these due to them not being stored in the proper position for a decade or two. Easy fix once they are opened up.
Oh I am sure professionals would say they are not rebuildable since they are crimped housings.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.