See level gauges are great. Location and sensor selection were only challenges. Used two 720-ES sensors on front of fresh water tank. Stacked 6 segments and 5 segments. Use a 710-SS on backside of gray water tank. This required removing blank panel in front of storage tray and finally, used 720-JS (6") on outside edge near the rear , next to piping for black tank. This required pulling dinette paneling up. Have pics if you need. I think I cut 1 segment off this but would have to recheck. Used speaker wire and left original sensors intact since I couldn't really access the ones on fresh and black anyway.