Take your wires and hook them up to a simple toggle switch, either flip or push button or whatever to control your O/D, there really isn't THAT MUCH too it unless your gonna try and mount it nice and flush into your dash or center console or something. Do a search I remember seeing a nice vfaq or something of the sort for doing a custom install into the center console.
New Ride: 94 Acura Integra GS-R 5-Speed Comptech Intake Tein S-Tech On the way: Integra Type R Transmission with LSD GReddy Turbo Kit (by end of summer hopefully)