It's always best to have one and an added bonus is that adding stuff in the future is much easier. And you'll have the option of switched and unswitched power. I use the FuzeBlock to power the P3 brake lights, power amp, XM radio, GPS, and an accessory plug.
tsp
Blog: www.swriding.blogspot.com
tsp
Blog: www.swriding.blogspot.com