Gents,
I did research and thinking. It’s were I am:
1- I found I cheap speedo, but with led light and with a lot in it. They said rpm can be set for two or four cylinders... I guess few features will not work properly. But I like it...!
2- Mcv-7000 Dakota, the one you referred me. One of the best on the market, but i’m not in love with it...
3- Koso, a few on the market can do the job. Around 200 $. Respectable.
4- iPhone speed tracker pro. I buy it already (5$). That will be my first test.
5- RPMitUP. Seems to be the app the most complete. But in the same time they talk about some stuff i’m not sure about for Harley...
Those are my options for now.
My next ride, when I come back of work, will be Tuesday.
Merci messieurs pour votre précieuse aide.