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Has anyone tried to repair their existing tach circuit board - or is the simple solution just to replace it with a reproduction board? My guess is that a 59 cent radio shack part would probably be all that is necessary.
I remember that my C4 only required "freshening up" of some solder joints and I remember that an XJ6 required to new resisters be solder in a cruise control board. In that case, the new board was $479 and the two resistors were just over one dollar.