Tandem Helicopter PID Tuning

Hello Everyone, i am trying to build tandem heli using pixhawk, but i am not able to get servo motor connection to pixhawk from the blog or pixhawk website, can anyone tell me how to do the connections of the servo and main motor to pixhawk.
thanks in advance. i am sending a sample image which relate to my tandem design.


i am newbie. so dont know much about these. thanks

hi,frizensami .How is your tandem helicopter now?