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Hi Burt,
Since you have a StarShoot Autoguider, do do not need the GPUSB for anything (GPUSB is usually just a way to get a ST4 guiding interface when using a webcam or planetary camera which has no ST4 interface).
I use a similar guide camera with my GM8 (non Gemini). The only thing I need to remember is to reset the RA slew speed down (on the GM8 492 electronics) down to 0.3x or 0.5x after slewing ..... to allow small movement increments for PHD calibration and guiding.
Hope this helps.
Jeff
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