Can you use a Spectrum GX7 with a RealFlight g5 simulator?

I assume you mean DX7. They do include an adapter to use Spektrum radios. It is kind of a hassle though. You have to plug the G5 Transmitter in via USB, then run another cord from the back of the G5 transmitter to your DX7, so you end up with a tangle of cords just to fly. The transmitter that comes with it is really nice though, so I very rarely, if ever, hook up my transmitter.