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Actually, with regard to ST4 guiding, you can guide with ST4 and still have information from the mount so that you do not need to constantly recalibrate on every change of pointing, if you are controlling the mount via ASCOM. You can chose ST4 guiding but select your mount driver in the "Aux mount" setting. But if you can pulse guide, I would. If you are pulse guiding, or using the aux mount feature, some mounts require the dec guiding to be reversed after a meridian flip. There is a meridian flip assistant that can tell you if that is needed or not. It calibrates the guider east of the meridian then asks you to slew to a point west (Causing a flip) and calibrates again to see which way the dec guiding runs. Then it will tell you to select it or not.
It is pretty simple to tell anyway, if you are pulse guiding and the first Dec guide pulses after a meridian flip cause the star to run away off screen faster and faster as the guide pulses increase Whatever the "Reverse dec output after meridian flip" box in the guide tab of the PHD2 brain is, you need to reverse it.
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