If youre converting your CP to a CP Pro then you also need to toss the 4 in 1. Buy the 3 in 1 and 6 ch RX. Theres a gyro already installed in the 3 and 1.

You can also keep your CP TX without having to buy the Pro TX. The only difference in the 2 TXs are the Pro has a knob for remotely adjusting the gain. It also has a knob for your throttle curves when in idle up mode. So if you dont plan on adjusting throttle with the knob while flying inverted etc then just stay with the CP TX like I did.

Search for Horizon Hobby. That ll give you the home page. Then look for Blade helis and hop ups for Pro