What does Formula-S stand for

swedefish said
The "Formula S" stands for the formula that seperates the stock Barracuda
from the S modell, a more powerful engine, bigger brakes, tach in the dash,
front swaybars, etc.
It´s the formula that makes the Barracuda a killer car, 8)

FWIW, the tach was not part of the Formula S package (at least in the 67-69 cars). The tach was an option.