are u talking about that long stripe of LEDs that is used for another brake light?
i personally think they are cool as hell. there is a dodge ram running around town with one an it looks very clean, been thinking about putting on my truck. but i doubt i will because of the rear bumper im putting on. personally i dont think they fit on any truck with out a rollpan. the deff look a lot better with out a bumper.
im not 100% positive how the hook up, but my best guess would be there is 2 wires. positive and negitive, and you splice it into the tail light.
bascially just take the neg and ground it to the truck. and run the positive into the taillight positive. you can get a little i think they call them T clamps. you put it over a wire and close it. and it cuts into the wire with out cutting the wire in 2. then you can put a connector on the LED bar and it plugs into the clamp. very easy, take about 10 min.