What’s the exact process to identify a real 66 Formula S Barracuda?

But now the BIG question what speedo does it have? And how long have you had it?

120 speedo. Nothing else from the decor group, vaccum gauge or tach were the only single gauge options, and it has the vaccum gauge.

The only other options it was ordered with were remote door mirror, underhood pad, sure-grip, and 383, which came with the Formula S stuff.
Bench seat, no radio, hubcaps.

I have the fender tag and IBM buildcard.

It had period, old, Cragars, Superior 500 wheel, Hurst, which is a one year only bench shifter, and traction bars.

I bought it from the third owner, who flipped it, spoke to the second owner, who verified the same condition.

My 120 speedo crapped out years ago, and I found a cherry 150 speedo here on fabo, so I grabbed it.

67 speedo is one year only, technically, due to the screw on cable. Tough to find a 150.

I also found a page that states in 66 only, the Formula S came with a tach.