You can do exactly what you want, it will be very very simple. Our Gp's brake lights are duel filament bulbs. One of the filaments is the turn signal and the break lights, the second filament is the night time running lights. All you have to do is splice the positive wire for each of your strips to there respective sides turn signal filament wire, I forget the colors but I can look tomorrow. Then splice both the grounds to the common ground all the tail lamps share. Thats all there is to it!