Allentare White/Grey Fuel Level Gauge - Use w/Marine 240-33 Ohm Fuel Senders - 12V Allentare marine gauges provide an ideal, cost effective solution for new boats or drop-in replacement gauge for older boats. Allentare gauges are designed to work with most commonly found marine senders and wiring harnesses used today. Features: Connection: M4 Stud Diameter: 2-1/16" Diameter (Metric): 52mm Dial Scale: Single Input Type: Analog Mounting Hardware: Included Voltage: 12V