If you just want a basic system then the Autopilot functions can be done with the Skyview & sell the AP74.
However if you want to have the a/pilot control to be separate then you will need the SV-AP-PANEL,another feature of this unit is it allows the 'Panel' to do "auto trimming" of the electric Roll & Pitch Trim (Ray Allen type) motors, if you have them. I'd allow for space in the panel anyway, just in case you change your mind later.
HTH
Jake J