1. Numbers and pointer clearly show. 2. Lighting on the dial for easy reading in the darkness. 3. High sensitivity and easy operation. 4. Professional installation is Highly Recommended. 5. Specification: Installation Dimension: 52mm Installation: lock the gauge to baseboard directly or use the holder Background light: White Indicating: E-1/2-F (E means vacuum, 1/2 means medium fuel, F means full fuel) Working Voltage: 12V Signal: Matched with Fuel Level sensor Fuel Level Sensor Length: 350mm 6. Package: 1 x Fuel level Gauge 1 x 350mm Sensor