If it looks like the picture below, it should be the two pins that are circled that connect when the switch is on. Probably a black and an orange(the other black will be the ground for your dash lighting). I'd double check the two wires with a vom for continuity when the switch is on to make sure though.
Tap into one of the other gray wires in your dash for your dash lights and connect it to the gray wire on your switch. Do the same for the black ground wire. That will take care of the dash lighting/dimmer part of wiring it.
Then wire one side of the switched wires from a positive feed(you'll have to decide whether you want it to be always hot or only hot when the key is on) then the other wire will go to your relay trigger.
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Hope that helps.