Faria Euro Black 2" Water Temperature Gauge - Metric (40 to 120 C) [12814] Brand_RAM Mounting Systems So the only piece left

So the only piece left for saltwater to attack is this little zinc anode

Mouting Hole Diameter Inches: 13/16

Standard Duplex Cable - Flat 12/2 AWG - 2 x 3mm² Red/Black - 100'

Box Dimensions: 4"H x 9"W x 16"L WT: 1

Faria Euro Black 2" Water Temperature Gauge - Metric (40 to 120 C) [12814] Brand_RAM Mounting Systems So the only piece leftEuro Black 2" Water Temperature Gauge Metric (40 to 120 C) Perimeter lighted Black dial with bold White graphics, Black aluminum bezel, contoured White pointer and flat glass lens. A temperature gauge operates by sending a low amperage current through the gauges meter to ground via a sending unit with variable resistance. The resistance of the sending units increase or decrease with the changes in pressure, temperature, etc As the sender's resistance