expert HELP needed

identified a slight dilemma with my 72 Challenger Rallye, just noticed or actually was noticed by a fellow Mopar guy that my dash has an 8k tach and supposedly should be 7k my dilemma is the clock adjuster goes through the lens as it should in 72 and the trip reset adjuster through lens as it should. do I need graveyard cars or do we have an awesome Mopar guy here
Thank you in advance
Author: xtopfuel