Replaced the old holding tank monitor with a new SeeLevel Monitoring system on my 87 Coachman. I wanted to stay cheep so I went with the basic system fresh,gray,black and propane only. Repaired the broken wires fixed the grounds and installed the new panel and sending units took about 4 hours. The new panel is about 3in shorter than the old and left a large hole to fill, also the old panel had the water pump switch and a battery level indicator so I needed to replace them. Here's the new water pump and battery monitor panel.