This is the Gen 2 JRK board used in current large Torxis i00600, and i00800 servos. It requires a custom program to operate. It can be used in legacy servos with the addition of a new program and new mounting plate (i09495). The i09495 mounting plate has the mounting pattern for both control boards and is a drop in for all large format Torxis servos. If you are not comfortable installing a new control board, please contact us and we can do it for you and install the correct program.