I purchased and installed the SupaBrake II brake light modulator on my Street 750. Installation was very easy, requiring to remove just the seat. If you specify when ordering that it is for HD Street 500/750, it comes with the correct connectors to plug it in between the connector under the seat which supplies power to the tail light section. It works great. You can read about its functionality and order it at SupaBrake-II motorcycle tail light modulators | vizi-tec, if interested.