I used to think that when I was younger. Then I realized how HUGE a task that would be. If by some miracle, the US did switch to metric, I wouldn't have a problem with it but I know some people will.

About using stickers and such, it's not that hard to guess at the speeds is it? Just do what asiandoood and Bumnah said and guess. I'm sure it'll come naturally after only a day or two behind the wheel. (Heck, it feels "natural" to me already and I don't even have a KPH cluster. h: )

Out of curiosity, would it be possible to just switch the tachometer over from the SiR cluster into whatever USDM one you're using?