Does anybody know what this is 1966 Barracuda

Another side note:
That "converter box" (not sure of technical term) does not play well with electronics including the
Electronic ignition systems found in new MoPars (1972 and up). It was used with points.
I have a tach, sender and wiring for sale if your interested from a 66' formula S dash.
It is not listed on here but available.