Be aware when looking at them that there are two different tachs. The housing is the same, but in 1966 (B-body and possibly C-body) required a separate sending unit and will not work without it.
V8 Darts with console (GT or GTS) could be fitted with the tach from 67-69 and they differ from those in B or C bodies in that they have an additional pedestal lifting the tach off the console top plate about 1/2". There may or may not be reproductions of this pedestal available. Replacement circuit boards are available from Real Time Engineering, but not reproductions of the entire tach. I just looked Friday as I sold my spare (empty) housing for what the tach was worth twenty years ago........It did go with an NOS lens, though.
Good luck with your search. If you have any other questions, just ask. I also sold the tach and console I have been holding onto since 1981 last year.
