Hello, does anyone know where I am supposed to connect the red and black wires of the Pertronix to in order to maintain operation of my tach? My car is a 75 W116 280S that has the stock ignition control unit mounted on drivers fender. I do not wanna scrap the stock benz switch gear..just wanna basically replace points with pertronix..Thanks for any help you guys may give..

At the risk of suggesting what would seem to be the obvious source of information:
ask Pertronics.