RE: CPv3 Questions Gyro/Receiver
Your connections are correct. To get the ESC to arm you may need to wait until the gyro initializes. Once it is, some of the smaller ESC's require full stick movement from zero to full (throttle/rudder) to zero. Try moving the rudder full left, full right, and then full left again. You may need to wait for some beeps from the ESC.
On mine, I only need a zero throttle before it is ready. To do this, I just rotate the heli nose left which makes the gyro give a zero throttle to the tail's ESC. Carefull, after it is ready the tail motor spins up to about half power. I then move the trim to full left to kill the motor while installing the canopy.