How to fit a Break Controller in Mercedes Sprinter Van

:) , I already know the feeling of driving tons of tons without proper breaks. but I guess as Im getting older and hopefully wiser , I do not want to risk killing somebody for a price of a controller and couple of hours work . That Franklin is a heavy bugger and it takes little rain ( Im in the UK) to feel like on the ice rink . Anyway, I have decided to purchase Time delayed controller , and would like to thank everybody for their help . Thank you , Tomek