blue and brown, brown rns power back to the taillight when the lights are switched on, it also runs the speedo backlight, blue is running the high beam indicator light and also high beam. also the stoplight switches from the brake levers are blue, but those r not in the pic
get one of these test lights - clip it to a ground and poke the probe in the wires to see which have power. once you find a light wire that's got power - you connect that to the your light, and the other side to ground and you're gtg. simple.