The RV Electronics Twin Water Tanks & Voltmeter LCD Gauge is an advanced monitoring tool with a colored LCD analog display and LED backlighting. It displays five levels and requires a 12V supply, drawing only 50 mA. The gauge has a power on/off switch and is compatible with various lead sender probe lengths. This gauge is perfect for monitoring water levels in RVs, ensuring efficient use of resources and preventing potential issues. The LCD design offers clear visibility, and its low power consumption makes it ideal for continuous use without draining the battery.THIS LISTING IS FOR THE GAUGE ONLY. RV TANK SENDER PROBES ARE REQUIRED.If you don't have a 12 volt supply consider the LCD water gauge versions as they have an on-board battery.