I need some help please.I'm installing a gear indicator on my bike and don't have a wireing diagram. The instructions that came with the Digitech gear indicator does not tell me what color the ground wire is... I was able to locate all other wire coming out of the speedo but the ground. My first assumption is that it's black/white but I don't know for sure. CAN ANYONE TELL ME WHAT COLOR THE GROUND WIRE IS COMING OUT OF THE SPEEDO/TACH?