Add on a Cruisemaster and increase any boat's effective range by accurately recording total fuel consumed at the engine and pinpointing optimum speed. Now you can spend more time fishing or cruising knowing you have enough fuel to make it back to port without relying on inaccurate tank floats. Not only will you enjoy the peace of mind of optimum performance and increased cruising range, Cruisemaster pays for itself in better fuel economy! 3 1/16" diameter gauges work with inboard, I/O and outboard engines. Single engine models come with meter and 1 sensor. All models have a black bezel. One year warranty. For gasoline engines only.