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.
(example: http://rh1project.files.wordpress.com/2011/03/procarbon_computer_mount_onbar_ww.jpg)

The second picture shows what was inside the package of my speedometer.
For this project you will need:

(Cheap) Speedometer
zip ties
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.)

Step 1: Decide Where You Want to Install Your Speedometer

I chose to install mine on the stem of the handlebars, rather than the handlebars itself. I like to keep the handlebars free so I have more room for my hands. To install it on the stem I have to change the orientation of the mount.
Find a zip tie that is big enough to fit around either the handlebars or stem of your bike.
Plan where you will fit the sensor on the front fork, and how you will route the wire to the sensor. Like most people, I will guide the wire alongside my brake-cable.
As you can see in the picture, the mount for my speedometer was in the wrong orientation, it also wouldn't fit my handlebars since the bracket was way too short.
<p>Very cool and simple! </p>

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