Abstract: A sensing device for monitoring engine coolant temperature comprises a two leaded thermistor, a single lead thermistor and a single lead bimetal switch in a compact shell. The switch and one thermistor are electrically grounded to the shell. A bimetal leaf is welded to the end of the shell and its free end extends to an adjustable central contact. A spring assembly biases the grounded thermistor against a shelf near the end of the shell. The leaf and the spring assembly are canted at an angle to conserve space. The other thermistor is supported by an insulated closure in one end of the shell.