FED- pitch count rule implementation

[rbmartin]

My state (Indiana) announced they have adopted a pitch count rule for the upcoming season. (120 pitches per game or less depending on number of days rest).
My question is, what additional tasks, if any, will the Umpires be required to do to implement this for their games? Will they be required to tell the coaches when they must pull their pitchers? When a replacement pitcher is put in, does the Umpire need to know the pitch count status of the player?
I was hoping for some input from some of you gentlemen who have worked with a pitch count before.