Help with simulation on hardware

Hello,
I am using sitl on hardware and I am wondering if there is someway to simulate rtk gps , and gps for yaw, instead of using 3dfix and compasses.

Also, is it possible to use relays with the simulation on hardware? I set the first pin to be auxout 6 and a aux switch to set it to high, but when I measure it, there is no voltage.

Do I have to set SIM_OH_MASK to some value?