Threaded radiator cap with built-in thermometer enabled driver to observe water temperature of engine coolant so as to be aware of possible engine 'overheating'!
MOTL - MOTM - MOTO - MOTO GP - MOTOA - MOTORCOACH - MOTORCYCLES - MOTORSHIP - MOTOS - MOTR
"MOTOMETER." Abbreviations.com. STANDS4 LLC, 2015. Web. 27 May 2015. <http://www.abbreviations.com/MOTOMETER>.