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How a tachymeter works is basically, get in a fast car, and in this case (depends if you can find one in miles or kms) Drive 1km at a constant speed (without knowing the speed) and if it takes you 10 seconds you're going 400kms per hours
30 seconds = 120km/h
and of course 60 seconds = 60km/hr.
They make watch bezels in either Miles or Kilometers. So often it can really depends where you buy the watch from. And as I import some from the states, they will be in Miles. I'm not bad at converting in my head, so this doesn't bother me in the slightest. Nor will I really ever use it.... But it can be used for calculations on long road trips.
I do a lot of road tripping, so I would look at my avg speed and compare it to the dial to see expected time per unit, and work out my arrival time. But, I can do this in my head, so it's just a decoration on most Chronographs.
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