FOUND!!! 1968 Barracuda Factory Tach Wire Hook Up

If my memory serves me correct, for a 68 Barracuda, the tan lead goes to the negative side of the coil and the blue lead goes to a switched power source at the fusebox. Also, check the back of the tach before hooking up the leads. If they are on the wrong posts coming out of the tach and you hook them up, you will fry the tach.