Spirit System

I just picked up a used Spirit, kind of wondering how to power it if you can't add power thru the sys or ele/pit/ail ports
Throttle to aux, no built in bec
servos 1-4
srxl to rud

do i have to y servos to get power in?
wanted to use one of the Spektrum SPM4649T rx's and Castle rpm to PIT
maybe i cant make this work?

Hello,

we are selling high power y-cables that can be used for the purpose.
If you are using a normal receiver, there are usually enough ports. But in case of satellites and external BEC it will be needed.
You can connect it to AUX, RUD, CH1, CH2, CH3 or CH4.