I'm having problems with erratic readings on my tach.I've checked the connections and settings on the tach side.Does anyone know where the tach wires connect on the motor or what color?Motor is an 1998 cabureted Mariner 150.I saw a electronic box on the right side(from rear)near starter that had terminals with rubber caps on them.By those terminals were raised words reading white,brown etc. What was that?Any help is appreciated.