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An apparatus for indicating the quantity of fuel in a vehicle. A variable resistance device, consisting of a bar resistor having its ends short-circuited and a slide, provided with a float, mounted on a guide bar, converts changes in fuel quantity into changes in electrical resistance which are indi

An apparatus for indicating the quantity of fuel in a vehicle. A variable resistance device, consisting of a bar resistor having its ends short-circuited and a slide, provided with a float, mounted on a guide bar, converts changes in fuel quantity into changes in electrical resistance which are indicated by a fuel gauge. The variable resistance device has a non-linear change in resistance with the maximum resistance when the slide is positioned at the middle part of the resistor. The pointer of the fuel gauge moves in one direction and then reverses direction in response to the non-linear resistance change, with the one-half tank level being the turning point. A lamp in the fuel gauge is actuated by a detection switch when the one-half tank level is reached so that the lamp indicates to the vehicle operator that the gauge is measuring the remaining one-half of the fuel.

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An apparatus for indicating the quantity of liquid in a container, comprising: (1) a gauge adapted to indicate the quantity of liquid, the gauge having a first side connected in electrical circuit with a power source and a second side connected in electrical circuit with a variable resistance device

An apparatus for indicating the quantity of liquid in a container, comprising: (1) a gauge adapted to indicate the quantity of liquid, the gauge having a first side connected in electrical circuit with a power source and a second side connected in electrical circuit with a variable resistance device; (2) a variable resistance device comprising: (a) a resistance means having a first end connected in electrical circuit with the gauge, the resistance means having a point near the first end short-circuited to a point near a second end thereof; (b) a float responsive to the liquid level in the container; and (c) a contact means responsive to the float and further connected in electrical circuit with the resistance means and with a source of reference potential, whereby in operation the gauge indicates liquid quantity in response to changes in resistance in the variable resistance device, such changes including at least one non-linear change in resistance occurring at a predetermined liquid level thereby causing a reciprocal displacement in the gauge; and (3) a warning indication means connected in electrical circuit with the power source and with a detector switch means responsive to the predetermined liquid level, whereby a warning indication occurs when the predetermined liquid level is reached.