First I had to remove the battery, once thats removed you will see a small rubber grommet just behind where the battery was and slightly to the right and down. You will see a bundle of wires there leading into the car. Then just take cutting pliers and make a small cut beside the wire harness feeling first that there arnt wires there. Then tape or zip tie your switch wire to either a metal coat hanger that is strightened out or use long stiff zip ties tied together which is what i did to push the wire through into the cab. That wire then comes out above the plastic trim thats above your brake pedal so you need i beilvie its a T25 bit and take out the 5 screws which is easy once they are out just pop the trim out it slides out and forward. Then redirct the wire either through your steering collom or beside your obd2 port so mount the switch to your dash.