This engine monitoring system (EMS) is the simplest in our range.
It is a water level alarm only and works very reliably.
It comes in a compact 80x40x21mm case and it by far the nicest looking water level alarm on the market.
All it needs is a power supply from the ignition, and a single thin 4mm stainless steel bolt drilled through the water expansion tank of the radiator system.
(Take note, the above applies for high pressure expansion tanks systems only. For low pressure expansion tank systems, another position for the probe has to be found - like a plastic radiator cap.)