I have a 1995 Itasca with a 75 gallon fuel tank. the sending unit is not working and I was just told that replacing it would cost $900 because it has some type of integrated sending unit system..they didn't say if the whole tank is replaced or just the sending unit. I've replaced them in boats and other vehicles and it was nothing special. the frame is made by Ford. does anyone have any experience with this issue or have more knowledge about what might solve the problem at a more reasonable cost. any suggestions or references would be greatly appreciated. thanks.