Disconnect the ground terminal on the battery.Don't blame me for any :explosive: if you do not do this.
Remove the side panel, insert a straightened coat hanger straight through the foam sealant, it may take a few tries.
The coat hanger comes out here, sorry the photo is a bit blurry.
Attach the wires for the switch to the coat hanger. I used a crimp-on connector and electrical tape.
Carefully pull the coat hanger and wires through the foam sealant.
Drill a hole in the dash panel and install the switch.
Terminate the wires with crimp-on connectors.
Connect the terminated wires to the switch.
Connect the other ends of the wires to what ever device(s) the switch will control. In my case it was a relay for a pair of off-road lights.
Re-connect the ground terminal on the battery.
Test your installed device(s)
This install required three wires because I used a switch with an indicator light. Typical switches may only require two wires.
Hope this helps.