Thanks for the replies!
I'm going to back-burner the autoguiding question. The pressing issue is how to connect to the SBIG filter wheel FW8G-STT.
SGPro v2.5.1.17 indicates “SBIG Error while opening CFW device: DRIVER_NOT_OPEN" when I attempt to connect. I can connect to the SBIG 8300M camera.
Does SGPro look for a native SBIG driver? I don't believe there's an ASCOM driver, is there? Do I need to point to the SBIG driver somewhere in the SGPro software?
Thank you!
David