I have a 1999 Monaco Windsor Mechanical 8.3 Cummins, The KC2600 throttle control(stand alone Drive by Wire/Cruise Control) took a crap in October anyone have any experience in a Retrofit to something else?

I found a 2600 on a wrecked motor home in a salvage yard about 6 years ago. The engine had been taken out but the actuator was still on the frame. Im not sure if King is still in business, but it might be worth a shot to look for one in a salvage yard. I also installed some 20+ years ago on OTR trucks, maybe a heavy duty salvage yard could help you out. I personally have not tried any other pullback models.