How do I work the cronograph and tachometer on my watch?

Question

Its a Swiss watch but I dont know how to work it, help anyone!!!

Answer 1

Well, which is the brand? I'm sure it's possible to get a user's manual by download or by request per e-mail.

Actually the tachometer is no function to "work" - it's only a matter of reading the scale. Considering 1km done, using 1 minute for this would mean a speed of 60km/h - passing 1km in 15 seconds means a speed of 240km/h.

That's all about - and in miles it's all the same. Considering 1 mile done, using 1 minute for this would mean a speed of 60mph - passing 1 mile in 15 seconds means a speed of 240mph.