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First thing you need is the "buzzer" tach mechanism with the internal electrical contacts (lotsa luck). Then, after you have it installed, you won't be able to hear it (which is why they cancelled it).
John is right as usual .
The 63 cars had a different pan that held speedo and tach (well same pan but it had a hole in it) ...The Tach main frame had a slot cut in it and a fiberboard style piece that the buzzer wire attached to and had a special speed cup with a wire filament now thats hard to find as most were broken after any kind of use.The original buzzers are pretty hard to find as well.
The redlines on the early buzzer 63 tachs were a different color than the later tachs it was more of a brick red for the red line and more of an orange for the yellow .