I had my 65 led third brake light wired in to the turns and did the chaser it was a pain in the ass to wire. i made the circut board to do it. then I got a short and tore it out (it was in for 3 weeks) here is the schamatic I went off of.
here is a pic of the one I built
and the led wires befor install (find a short ?)
just giving you a heads up. cool mod just a pain
NOTE: if you don't understand this drawing then research before you start building. I built the board on a 2" x 2" board so its small.