Hi ! Welcome to IRV2! We're sure glad you joined the gang!
As for the fuel gauge, I would suspect that you have a wire disconnected somewhere, probably at the sending unit on the fuel tank. It could be the sending unit itself.
I think the cruise control feature is a function of the SmartWheel controller, although I'm not sure. I just had to replace my SM209 controller module with the updated SM210 because the headlights would not work. You could call tech support at Vehicle Improvement Products at 847-395-7250 between 8AM & 5PM, and get their input on this. I suspect your 2001 Windsor has the same module as my 2002.
Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD