Interesting 1965 Formula S Info.

jazak5 said

my mostly original 2 owner 69 340 formula "S" has only the 120mph speedo and no tach

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Like I stated, 1966 was the only year that every Formula S had a 150 speedo (as well as every 273-4 Barracuda). The tach was part of the Formula S package in 1965 and I believe 1966.