I am really confused as to what you are trying to acomplish? Is this a CP or CP Pro?

1) If you want a HH gyro, in the back of the CP Pro book it shows how to connect a gyro to the 3 and 1. If you have a 4 and 1 you need to look to some others on how to hook it up.

2) If you are trying to upgrade TX to give you more control, either Specktrum or Futaba 7C TX. For about $150 you can get a 7C and it will fly your current receiver if it is in FM mode. (I got a 9C)