Did any 72 demons come equiped w hood mounted tach??

Local car dealer has a 72 yellow Demon. It is a 318 4 speed car and has a tach mounted to the hood. Looks like a firebird deal to me but he claims his brother bought the car when it was only 2 years old and it was an option. No fender tag or build sheet so is this possible or is he a story teller like most of the other car dealers?