Aw Paul, you beat me to it...
I'll chime in here since it's my diagram, I need to write this up so I can copy and paste.
I may not make much sense right now as I'm recovering from a bout of Suspected West Nile.
Are you only looking for info anout the switch?
On the tailgate switch diagram from left to right;
The power pin goes to a source of power. Should be a continuous source.
The switch pin goes to the power side of your relay (Terminal 86) if you use a standard 4 terminal relay. You ARE using a relay aren't you?
The Pin Switch pin goes to an optional pin switch that needs to be installed so that the Indicator ligt comes on when the rear door is open. You could hook it to the pin switch that comes with the kit and hooks into the passenger side wiring harness but, the Indicator ligt will come on if ANY of the door are opened.
The Ground pin gets hooked up to the Green wire with the Red stripe on the back of the defroster switch. Use Scotchlocks.
The Dashlights pin gets hooked to the Red wire with the Green stripe on the back of the defroster switch..
The last two are so that the light in the Tailgate switch will dim with the rest of the dashlights..
Hope it helps.. If you need more PM or email me..