I installed the Kissan unit on my 2000, www.kisantech.com . The control units mount right onto the backs of the bulbs, remove the factory bulb connector from the bulbs and install the master on one of the bulbs and the slave on the other then re-connect the connector to the units. Run the photo sensor to a location, preferably facing up, I chose a spot on the tunnel cover. The modulator works on the high beams and is "programmable" for the light level you want them to start/stop flashing vs the factory setting. It is unlawful for the lights to flash at night, the photosensor turns the modulation off when light levels are low or entering low light conditions such as a tunnel.