It doesn't matter in this case...
160mph = 260kph
The sweep range is identical in both case, so no need to adjust anything.
If you do change the range - like some 180kph J-spec units - it's just a matter of swapping out the plastic (usually) ratio gear sitting "underneath" the speedo cable end in the transmission.
This is the typical way you change the speedo output on most cars.
-Ted
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