There are a few ways to do it, the cheap and easy way to do it is to strip a section of the insulation off the handbrake cable, remove some insulation from the end of the handbrake cable from the turbo timer. Wrap the end of the cable from the timer around the exposed handbrake cable and then used electrical tape to cover. Or you can solder the wires together at some point, essentially there needs to be a physical connection between the handbrake wire from the turbo timer and the actual handbrake wire. It is simple, I did it without any specialist tools or equipment just a Stanley knife, if your not confident you buy something like this http://www.ebay.co.uk/itm/Posi-Tap-6pc-assortment-pack-wire-connector-607-6-10-22awg-/380871386000?pt=Car_Audio_Video&hash=item58adb42390 but first I would watch this video on how to tap wires https://www.youtube.com/watch?v=Jtvi7bGenC4 essentially how I did it and works perfectly.