the wireing from that switch goes to the forward end of the headlight harness. I have that switch on my '89 limited. Right after the harness plug, moving towards the headlights, there will be a relay with 2 lt grn wires a drk grn with blk stripe and the larger red power wire. From that relay a green with black stripe and a black wire goes to the factory plug wires for the bumper mounted fog lights.
For the wiring to the dash, starting at that relay going back on mine is a tan trigger wire that goes to the dash switch.
The relay was a 30 amp and is located just infront of the airbox in the area near the fuel power ballast (the white thingy with orange wires).
Does that help?