I cannot speak to who you could send the tach to for a rebuild - I had understood that the broken clock rod means that clock is NFG - the clock kits require you to reuse that part.
The 1970 & 1971-1976 8'000rpm tachometers all interchange in your car;
The 1970 tach's are unique because they were the only ones made with the single "coil" connection on the back (seen in your picture);
Starting in 1971 a unitized distributor could be ordered, and the tach's received a second positive plug on the back - this one read (iirc) "12V";
That "12V" plug was used for 71-74 Cars with the unitized distributor and 1975-1976 cars (all HEI), while the other 71-74 cars with a points distributor used the "COIL" plug.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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