A temperature responsive electrical switch which includes a temperature calibrated pressure gauge employing a gas-filled sealed temperature sensing assembly comprising a bourdon tube connected to a thermal bulb by means of a tubular conduit. Enclosed within the housing of the temperature responsive electrical switch is electrical switch means which makes or breaks contact in response to variations in temperature at the thermal bulb which in turn causes motion of the bourdon tube. Means are disclosed for mechanically linking the bourdon tube to the electrical switch means to open or close the contacts of the switch means in response to temperature variations. Means are also disclosed for adjusting the electrical switch means so that the electrical switch means will open or close at a precise temperature which is visually displayed on the temperature responsive electrical switch.