I was reading the HOW-TO found here (http://mustangworld.com/ourpics/fcar/dzshiftlight.htm) and it says that i have to hook up the (+) and (-) wires anywhere, but the other wire has to be hooked up at the computer. I cant splice into the tach wire behind the cluster. Does anyone know why not, or if thats even true? It would be SO much easier if I could just tap the wire behind the cluster.