This marine engine warning kit consists of a buzzer that sounds when your boat's engine oil pressure is too low or if the engine coolant temperature is too high. For inboard and I/O engines with 12 VDC electrical systems.
The buzzer is loud enough to be heard in most installations. Engine gauges are good- but you must be looking right at them when trouble occurs to be useful. The buzzer goes off right when the problem happens. I like to wire in a signal light too.