Most buggys that come factory with brake lights use a duel piston/ duel port master cylinders. Two ports off one piston are used for the front brakes only one port off the other piston is used for a rear brake. the spare port has a pressure switch for the brake light. If you have front brakes and a rear brake chances are you have an extra port on the rear brake side to install a switch. you'll have to remove the plug to confirm thread size. I'm thinking 8x1.25 but I could be wrong. Remember you'll have to bleed the brakes once that plug is removed. Any dealer can supply the switch. If you don't have a spare port on the master get one of these,
http://www.ebay.com/itm/WPS-Universa...96acb3&vxp=mtr
The master cylinder switch is a ground unit. the body of the switch gets chassis ground by screwing it into the master. When pressure activated sends ground to the tail light, one wire needed for connection at tail light. The universal is just a momentary switch . It has to have ground supplied then sends ground to the taillight when the spring is pulled.(2 wires) This switch can be connected to the pedal or any part of the linkage and doesn't require a brake bleed after installed.