i just posted on another thread
i have 2 kits left of kdogs tip tronic units
i can wire them up to plug directly into yr auto box
the cheap way to do it is with my cheap slelector boxes
but they work thru yr gear shifter
so what ever gear yr shifter is in thats what gbox selects
but if u want proper tip tronic then u need the kdog units
i sent one to new zealand the other day to a guy on these forums
only have 2 left
not sure if he makes them anymore
i bout afew sets 3 or 4 years ago