How to convert speedometer from miles to kilometers

If your car was manufactured for the US, then it probably doesn't have the ability to change. If you want to calculate it yourself the formula is 1 mile equals 1.6 kilometers.

Your best bet would be to pull a intrument panel off a odyssey in a auto wreckers in canada.You might end up losing a few lights (1 or 2) but should not be that important. Because canadian vehicles have extra lights: DRL, etc.
But the wiring harness should be the same so go for it, give it a try.

Dash clusters are integrated control modules that are programmed to specific vehicles and specific features so you can't just put a random cluster in there.