src brake light I called it a simulator, becuase it turns your single filament O.E. running light into a brake light by running through a resistor until you step on the brake when it lets full current to the light. It uses one of those banjo bolt switches.. I bought one of these things and it installed in about 5 minutes and actually works pretty good. It takes longer to remove and replace the plastic and tail lens cover than installing the device. I tried both a 158 bulb (stock) and a 198, and IMO the 198 seems a little brighter. It's still a wimpy amount of light, but it does work, is ridiculously easy to install, and only cost $38.. bringing me that much closer to an actual inspection sticker..