hello, i really need some good help. i just put an 83 xr500 motor on a blaster. the bike i got the motor from did not have much for wiring or ignition. it only had the coil and the other brass colored box on the coil bracket with 5 wires coming from it and on of them goes to the coil. what is that box. is that the only thing i need besides the coil and the wiring harness to make this thing run or is there more boxes or modules that i am missing. thanks.