Rarest A-Body Option?

Burntorange70 said

What about a tach on a rally dash. I have not seen to many of them that are factory instsalled.

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I've seen a quite a few, mostly 340 and 383 cars. My 68 is coded for it. I've even seen a 69 318 coupe 4spd and a 67 273-2 auto with them.