The switch is just in front of the tailshaft housing and has a pigtail going to a plug. (drivers side)
The one on the drivers side about mid-way is the reverse lights (has two pins sticking out the top). You may also have a sender on the passenger side which is the speedo.
The TKO manuals are here:
http://ttcautomotive.com/English/onl...er/product.asp
(the TKO is basically a upgraded 3550 so that's the manual you want)
Oh, forgot to mention what needs to be done.. Splice the two wires together from the chassis.