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David, I rebuild old tachs and the old Farias will work with MSD/Duraspark if you use the MSD tach adapter #8920. With the tach adapter, you can wire up current triggered (+ side of coil) or voltage triggered (-side of coil) I have done so with several Farias/Rotunda tachs, all of which are current triggered.
Hook up the current triggered to the red wire coming out of the tach adapter and the voltage triggered to the violet wire. By the way, Brandas are voltage triggered (-side of coil). Either way you go, you're right, they do look cool on the old Fords!!
Hope this helps
Mark
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