The old headlight switch flat out didn't work. Mike tested the wires and found that the old switch was the problem. A new knob was also added to complete the look of a fully restored dash. The new unit was a perfect duplicate of the factory piece and has the same plug style for a no hassle install. Once plugged in, the small retaining nut was tightened up (he also made sure to line up the little tab into the slot on the dash).