Gimbal setup APM 2.6

I have read about camera gimbal setup in user guide but still confused. Using tarot gimbal.

With APM 2.6 using 3.2.1 firmware I think I can have pass thru + in ROI tilt control via APM.

I don't see in MP a setup for RC6,RC7 or RC8 for gimbal.  I do see

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