Firstly, if you suspect any over speed, or any number, forget 130% do not fly it. There are power on and power off limits for the 206 in the RFM. If the aircraft is set up correctly, the auto revs will be set as party of a maintenance function, if you find they are wrong and want to go too high in auto you can control this will lever, your ear will soon tell you before the gauge does if the RPM climbs. If it is power on then roll the throttle off (i.e governor failure) to control rpm. If you let it go to 130% power on, everything is up there including the engine, transmission, head, tail rotor and the remainder of the drive train. It is all scrap post incident and in theory any part could fail when those abnormal loads are applied not just the swashplate.