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Just turn Swcd (or is that StSw) on for it to engage automatically above 25% throttle.
about changing head speeds in flight modes, you's have to plug the GV1 Aux \ RPM connector to the GYRO channel (no this isnt a mistake) and in the gyro function you can set different gains (headspeeds now) for different flight modes. i havent done it myself on a 378, but did it on 8103 and i believe its the same.
BTW, you now need to find a spare Aux channel for your gyro and use it on a switch of your choice.
Good luck !