Features: Adjustable Signal: 0-190ohm, 240-33ohm, 240-30ohm, 0-180ohm, 10-180ohm. 8 different backlight adjustable:Red-green-blue-white-yellow-yellow green-orange-purple. Marine Fuel Level Gauge has ultra-wide working voltage design( long-term operating voltage: 9-32V. IP67 waterproof and Dustproof grade,316 Stainless Steel. Easy to Install and Wire Up. The instrument has the characteristics of high accuracy, long service life, good seismic resistance, water and fog resistance, etc. Specifications: Working voltage:9-32V Operating temperature:-30+75°C Storage temperature:-40+85°C Connection 1 . Red-- + 9-32vdc 2 . Black--signal Input 3 . Orange--backlight ( + ) 4 . Blue--ground ( - ) Operation :1 . Press the Mode button ( less than 1 second ) to change the backlight color : Backlight changed in sequence : red ( default )green-blue-white-yellow-yellow green-orange -Automatic : As the gauges was set with the automatic , the backlight Purple- ( automaticwill be off for 2 seconds then lighten up , And will switch the backlight color as above sequentially. 2.Users could select the input resistance as down below operations if you have Fuel / Water / sewagelevel gauge . Hold the Mode button for 3 seconds toenter the setting mode , back light flickering for a whileThe needle point at the " E " position , and you could selectthe corresponding parameter via pressing the buttonas down Package List: 1xGauge 1xCoil 1xinstructions