Could you have a metric speedometer?

Glueing numbers to the face would be a better solution than spending $700.
This could be done discreetly and neatly.

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)