Patent ID: 6902318

Claim:
A thermometer for an engine of a vehicle, comprising: a temperature/resistance element that is mounted on part of an engine incorporated in a vehicle and that detects the temperature of the engine as a change in resistance; a resistance-frequency converter that is optionally connected to said temperature/resistance element and that converts the detected change in resistance into a change in frequency; a computer that calculates the temperature of the engine on the basis of a frequency represented by an output of said resistance-frequency converter, and displays it on a display; and a key entry unit for use in setting a warning temperature of the engine to a value selected from among a plurality of predetermined values and thus determining the warning temperature, wherein: when a temperature of the engine exceeds the warning set temperature determined using said key entry unit, said computer instructs a warning indicator to give a warning indication; the thermometer further comprising an engine speed detecting unit that detects an engine speed, wherein; said computer calculates an engine speed on the basis of an output of said engine speed detecting unit; when the calculated engine speed is equal to or higher than a shift timing point revolution speed and is equal to or lower than a shift timing warning set revolution speed, a shift timing indicator is actuated.