what do you means by change ? electronic or physical maybe just take a picture of a canadian odometer copy it on plastic and glue it on top of the old meter.
Have a look for a wrecked one in Australia or New Zealand, or ask for one of us done under to see about getting you a new speedo from here.
Is Canada Kms then, I'd a thought that seeing as their vehicle are just about all USa brands they'd be in miles an hour