With all due respect regarding 65 Barracuda S cars:
The 322 sales code option for the S package includes the tachometer as printed on the window sticker. The tachometer could be optioned on any 8 cylinder car (sale code 468), but was standard equipment with the S package.
SG (Sure-Grip) was an extra cost option with any engine or transmission choice or package choice, and true for either the 7 1/4" or 8 3/4" rear end. So far as I know, the only time Sure-Grip was a "mandatory option" was a 4 speed Hemi or 440 Magnum car with the required 9 3/4" Dana rear.
The only way I know to identify a factory Formula S package on a 1965 Barracuda is if the number "2" is stamped beneath the large letter "C" on the fender tag. And strangely enough, I haven't found the S package (again sales code 322) denoted on a 1965 build sheet. But all of the "S" performance components, such as the tachometer are on the build sheet.