Dear Ruiliang,
A similar question was asked before regarding the number of blade gages available for output, NBlGages (also limited to 9) – please see the following forum topic for my response: Increasing Number of NBIGages.
We are looking into an entirely different method that will allow users to define as many output gages as they want anywhere along the beam. We’ll make this new approach available for the tower, blades, and substructure in a future release of FAST.
Best regards,