Maybe I (and everyone else who previously answered) am not understanding your question.
The trail rocker already has a power wire running to the switches that turns on an led when the switch is triggered and the accessory is running (that is why the switch lights up.)
Some of the other answers are talking about tapping a dimmer wire in the dash so your switches (one led on the switch) is illuminated at night just like the rest of your dash. Again, with that type of set up, the other led on the switch will light up when the switch is triggered and the accessory is running (again, that is from the power line that comes with the trail rocker.)
So, did you buy new OTRATTW switch bodies so you can have one led turn on with the switch and one led illuminate at night with your dash?