Re: Tach Install Help
White is for the dash light. This is off the Autometer website...
What Are These Colored Wires On My Tach For?
Red = key on power supply
Black = common chassis ground
White = dash lighting power
Green = tachometer signal for standard or electronic ignitions
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)
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)
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
70 Nova SS 396, 4sp, 3:55 12 bolt