A friend gave me a beautiful '66 Rotunda tach. (I think it's made by Ferreia (sp?)). It will be the finishing touch to my restoration, if I can make it work.
It has three wires; red, black and blue. My old Sun has black, white, red and green. Does anyone know where the Rotunda wires go?
Thanks, Eric D

 

I would think.

Red to +

Black to -

Blue to Coil -

I doubt there is a Light in it.