Allentare Black 250 DegreesF Water Temperature Gauge Use w/Marine 450-29 Ohm Sender 12V Chrome Bezel. 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. Mounting Hardware Included. Voltage 12V. Diameter 2-1/16 . Diameter Metric 52mm. Input Type Analog. Max Range Outer Scale 250 DegreesF Allentare marine gauges provide an ideal, cost effective solution for new boats or drop-in replaceme Connection M4 Stud. Mounting Hardware Included Voltage 12V. Diameter 2-1/16 Diameter Metric 52mm. Input Type Analog Max Range Outer Scale 250 DegreesF