1966 Formula S Option

I have only Valiants from that era, but I think that the Formula S barracuda had the Tachometer.

Fender tag decoding, from the early cuda website For 1966 Models:

There are two areas to decode on a fender tag. The bottom of the tag (SO, NUMBER, BDY, TRM, PNT) is very similar to the 1964-65 version. The numbers under the capitalized alphabet indicate engine size, carburetor, transmission, and other options info.

Under the "AB" you will find the following: 11=170cid /6, 21=225cid /6, 31=273cid 2bbl,32=273cid 4bbl.

Under the "C" you will find the following: 1=3speed Manual Trans, 3=4speed Manual Trans, 5=auto trans.
----------------------------------------------------------
Under the "F" you might find the following..7=Formula S.
----------------------------------------------------------
Under the "T" you might find the following..7=Tachometer.

Under the "Y" you might find the following..1=black conv. top,2=white conv. top,3=blue conv. top.

For the second area of the tag, the Shipping Order number, date code and plant production Sequence Number are similar to that of the 1964-65 tag.

The BDY or body number code has been enhanced:

Valiant 100...................Code
---------------------------------------------
2dr sedan.....................VL21
4dr sedan.....................VL41
4dr wagon....................VL45

Valiant 200...................Code
---------------------------------------------
4dr sedan.....................VH41
4dr wagon....................VH45

Signet..........................Code
--------------------------------------------
2dr hardtop..................VH23
Convertible..................VH27

Barracuda...................Code
2dr Hardtop.................BP29