wind mill tach, easy

hi everyone, this is a short one, but too easy to not mention. if your trying to read the rpm of you gen just use a bicycle speedo, can be had for about 12-20$ and is easy to setup. install the wheel sensor on your hub and set the meter to 27cm and that's it. now rpm is the mph x 100. 28.1 mph = 2810rpm  --- 20.0mph = 2000rpm ----- 5.0mph = 500rpm , you get the picture. the meter can be mounted to the tail mount bracket and facing down so it can be seen or seen with a set of binoculars . thanks for reading.