65 Barracuda Formula S factory tach or tach bezel

Good luck in your search! Friend of mine sold just the front bezel at Carlisle for $200 to the first guy who came along and saw it. Same friend had a non-working tach - no can or wiring- sell it at the Mopar Nationals for $500 firm. I watched money change hands both times.
Not to sound stupid but what is the can?