Disconnect the plug on the back of the break peddle and cut the black n white wire run your switch through that its easy , i wouldnt bother with rally tyres i can get brand new mud and snows for 20 each there just as good ,if its a earlier model just make sure that the rear shockers are ok as they are prone for breaking , and buy a fresh car not an abused dogging bus as clutch tend to go or be going on second hand ones , if you get 1 and the engine managment light comes on i personally wouldnt worry as ive had 1 for 2 seasons with this light on , hope this helps and happy lamping ....