You will eliminate the Diode Dynamics Relay and Switch.
-You will need the Ground wire (black wire with ring connector on end) , The yellow wire in the switch harness, and the red wire that goes in to position 87 of the Diode Dynamics relay.
-All of the other wires can be cut and taped to the harness out of the way.
-Strip the ends of the red wire and yellow wire and twist them together.
-Connect the red and yellow wires that are twisted together to the desired wire in your auxiliary switch harness.
-Depending on your setup, you may need to wire the ground wire directly to a ground location on the truck or you may need to wire it to your auxiliary switch harness.
-As for the tail lights, give me a few minutes and I'll get back to you.