RAC Tachometer cabling

[cudajames]

Just picked up a RAC Tachometer part #63003580 to install (strap) on the steering column of my barracuda. I know it is old, kind of the point

There are 5 wires, instead of the normal 4
Red-power
Green-coil
Black-ground
Yellow-lights
Blue-?

Is the yellow a "hot" for lights and the blue a "ground" for lights? Anybody know?

Any experience with these tachometers or installation gotchas

thanks

 

[67Dart273]

I would just pull it apart. The light is almost always and easy-to see separate piece, and you can often ID it and the ground at the least

Be careful...........found this...........

http://www.jalopyjournal.com/forum/threads/tach-wiring-help.164893/#post-1814254