Harp string tunings can vary depending upon the player and/or the notes needed for a particular song. This string gauge calculator is helpful for finding the correct string gauge for the note/frequency you wish to achieve for the scale length of the string. The rule of thumb is to try and get 25-30lbs per string for steel core – phosphor bronze wound strings.
A commonly used tuning for Dyer and Knutsen instruments is to start the first harp string at a whole step lower than the low E on the guitar, or D, then tune each subsequent string a note lower than the previous string:
Strings can be purchased in sets for Dyer tuning and Bennett/McKee tuning on the Strings page.