Also try robotmarketplace.com they sell switches that would turn on the lights using power through the rx or picoswitches that run a small relay. i once took apart a servo with a bad motor and wired my leds to the motor output. I used the pot to adjust the position when my brake lights came on. i just stripped it down to the board. i suppose you could do the same for your application. i had it " wyed" into my throtle .