My car is from Canada, so i got used to some conversions. (The mph markings are too small for me.) When i need 55, i go 90. When i need 25, i go 40. I don't even need to look at the conversion cheat sheets taped near the speedometer as often. The speedometer itself is off a bit and seems moody, which allows for some needful guessing.
More recently, i downloaded a speedometer app for my Android, which works great outside of tunnels. As an odd side affect, i was shifting gears about every 20 kilometers on the speedometer (not the odometer!) and based on sound. With the phone covering most of the speedometer, i rely completely on sound.
Next time i'm in Windsor, it's just going to be weird.