If you ever bought a cheap speedometer like I did, chances are you had to get creative to fit it to your handlebars. Specially if you tried to fit it to the bigger bars on a race bike. Often the latches on the brackets are too short.
There are solutions on the market, but they are expensive and don't always fit the look of your bike. Plus if you could afford to spend the money, you probably just bought a more expensive bike computer with a bigger or with a rotational mount.
The second picture shows what was inside the package of my speedometer.
For this project you will need:
rotary tool (Dremel)
Speedometer magnet & sensor
(If you don't own a dremel you can always make due with a candle and a box cutter to make the holes.)