Check the FAA Type Certificate Data Sheets for the Pipers.
You will probably find the prop combination liisted with a note
about the tach marking.

If the prop was a result of an STC, it may not be listed. But
I think I've seen new Pipers with tachs like this.

Probably depends on what dampers are on the engine which
would be indicatded by the engine dash number.

Bill Hale A&P