You will need: bike computer, flashlight with solar battery with micro generator, tin, soldering iron, two wires, super glue.
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Step 1: Soldered Wires
Soldered wires to the contacts of the flashlight and bike computer. Observing polarity!!!
Step 2: Sticking a Flashlight With a Computer.
Use super glue.
Step 3: Install.
Install on bike.