Foreign Speedo, Inc in San Diego ( 619 298 5278 ) recently repaired my Smith/Jagger mechanical tach. The magnet assembly was replaced. Total price, $ 115.00
It looks and functions fine , although have no way if they did a Great job. The face looks new, no longer faded, but now looks darker ( perhaps same as when it was new ) which made other instruments not look the same. I suggest asking how the face will be cleaned, polished,etc , so you can duplicate/match the others instruments.
Robert
66' Tr4a Irs