Branda Tach Wiring

Hello all,

I am needing help with the Cobra tach wiring in my 66. The car has been in pieces for over a year and I have lost the paper that told me how it was wired. Just so you know it is one of the Tony Branda exact reproduction tachs from several years ago. I have went to their website and the wiring instructions are for a newer version then I have. The wires that are coming out of the tach are: solid red, solid green, solid brown (this is a thicker gauge then the others) and solid black, which I am assuming is the ground wire. Can someone help me with how this is wired? When I called Branda the salesmen said they only have schematics for the newer version and he didn't know how the older one is wired.

Thanks for the help.