This set includes the day-light sensor, both tested bulbs. Ridden over 1000 miles to the yard, and known to be working properly. The delicate wire to the master has been reinforced to prevent breakage. This set is ready to pop into your high lights, and run with it. $US165.95 best price I could find. instructions for setting up the modulator master are available in dozens of places. This applies to all Goldwings (including Valkyrie CF) GL1500 and GL1800 1988 to 2017.