Was thinking about wiring some custom switches for varios stuff in my car. I want the switches to turn on my equipment obviously but also want a small led light to turn on above the switch, when its in the on position. Anyways i didnt see any switch w/ led combo that i liked so i bought my own stuff. I need to know how what kind of resister to buy if im trying to run a 5v led off of the 12 volt system. Thanks!