Veratron 52MM (2-1/16") OceanLink Battery Voltage Gauge - 16 to 32V - Black Dial Bezel [A2C1066120001] Lighting set up the free app

set up the free app from App Store and you're good to go

Sensor has been used in bilge's for over 15 years

16-14 Gauge - #10 Heat Shrink Ring Terminal - 100-Pack

Bronze Garboard Drain

24 & 32v lighting options are available

Veratron 52MM (2-1/16") OceanLink Battery Voltage Gauge - 16 to 32V - Black Dial Bezel [A2C1066120001] Lighting set up the free app52MM (2 1 16") OceanLink Battery Voltage Gauge 16 to 32V Black Dial & Bezel OceanLink 52 mm Vessel Status Gauges are connected directly to any OceanLink Master unit using the patented EasyLink serial bus connection. Up to 16 EasyLink gauges for each Tachometer or GPS Speedometer can be daisy chained together. Interchangeable bezel option. Features: AMP Superseal Easylink 270 pointer deflection angle Reverse polarity protection Anti fog double lens