Motometers
by John & Henri Boggs.

French Aries.

A French motometer.  This one is brass, 2-5/8" in diameter & nickel plated (most of the plating has worn off) and a glass enamel insert on one side for the Aries Truck logo.

The disk is soldered to the body, so it is not replaceable.  However, the thermometer is replaceable by removing a screw from the stem and inserting a new tube.