So i know there is a write up below me on how to do an LED swap on switches, but i am a new member and did this over the winter but slightly different so i figured i'd show how i did mine. I know this isnt the best way but it worked out great for me and i havent had any problems since. I used 5mm 12V prewired leds that i got on ebay (100 for 20$).
So i first took out the switch and took it apart down to where you can see the stock green LEDs, i pulled all of those out and cut off the posts that they sit in so that the surface was flat. I then simply superglued the new leds directly on top of where the old mounting posts used to be and ran all the wires in a similar direction. Then i cut holes in the side of the plastic shell to allow all the wires to run out of the switch. Once i had all the wires out of the switch and it all assembled back together i just combined all the positives and all the negatives, so now that i no longer needed the switch to be getting the illumination power i cut the illumination wires that run to it (on my truck it was a blue with pink stripe postive wire and a black ground) and connected those to the positive and negative wires for all the new leds and soldered them together.
So i first took out the switch and took it apart down to where you can see the stock green LEDs, i pulled all of those out and cut off the posts that they sit in so that the surface was flat. I then simply superglued the new leds directly on top of where the old mounting posts used to be and ran all the wires in a similar direction. Then i cut holes in the side of the plastic shell to allow all the wires to run out of the switch. Once i had all the wires out of the switch and it all assembled back together i just combined all the positives and all the negatives, so now that i no longer needed the switch to be getting the illumination power i cut the illumination wires that run to it (on my truck it was a blue with pink stripe postive wire and a black ground) and connected those to the positive and negative wires for all the new leds and soldered them together.