Well, hereās what it is all about. I have a 59 Bugeye that, a few years ago, I replaced the 948 with a 1275 from a 67 Sprite. At about the same time, I switched the Bugeye to negative, and converted to a alternator. So now Iāve acquired a tach from a 67, and I want to put its mechanism behind the faceplate of my 59 Bugeye, but I donāt know its polarity.