The manual shows this mic pinout:
Based on that the audio cable for Digirig will look like this:
GX16-8 pin 1 (MIC INPUT) → Audio 3.5mm TRRS ring 1 (RIG_AFIN)
GX16-8 pin 5 (PTT) → Audio 3.5mm TRRS ring 2 (RIG_PTT)
GX16-8 pin 6 (GND) → Audio 3.5mm TRRS sleeve (GND)
GX16-8 pin 7 (PTT GND) → GX16-8 pin 6 (GND)
GX16-8 pin 1 (AF OUTPUT) → Audio 3.5mm TRRS tip (RIG_AFOUT)