What Are These Colored Wires On My Tach For?

  • Red = key on power supply
  • Black = common chassis ground
  • White = dash lighting power
  • Yellow = used only on Internal Coil Magneto tachometers as the signal wire
  • Twin Black = (looks like a lamp cord) is used on External Coil Magneto tachometers that use an inductive pick up (#5210)
  • Green = tachometer signal for standard or electronic ignitions
  • Gray = for tachometers that use a Hi/Lo shift light. When grounded, Lo shift light point is active. When ungrounded, Hi shift light point is active.
  • Blue = used on Playback tachometers to start recording (see playback tachometer instructions)