AutoMeter Auto Meter 200763-40 Gauge, Water Temp, 2 5/8", 100-250&ordm;f, Electric, Marine Carbon Fiber Features Front Sealed Bezel Design For Added Water Resistance And Up Protected Paint On Dial Pointer For Added Protection Against Sun Damage Requires sending unit 990344 (sold separately) 12 and 16 volt compatible, well-suited with nearly every marine electrical system