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A simple fuel consumption efficiency gauge employs a pointer mechanically coupled to the extremity of a Bourdon gauge. The pointer is electrically coupled to vehicle ground and is bracketed by two contact posts associated with high and low fuel consumption efficiency, respectively. Contact by the po

A simple fuel consumption efficiency gauge employs a pointer mechanically coupled to the extremity of a Bourdon gauge. The pointer is electrically coupled to vehicle ground and is bracketed by two contact posts associated with high and low fuel consumption efficiency, respectively. Contact by the pointer with either post completes an electrical circuit through a corresponding light emitting diode to signal good or poor fuel consumption efficiency. When the pointer is between the contact posts, current is continuously supplied to another light emitting diode through a load in order to signal fair fuel consumption efficiency. The device is housed in a casing adapted for connection to similar casings by means of clips and clamps.

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A fuel consumption efficiency indicator for use with a direct current power source having d.c. terminals of opposite polarity and an internal combustion engine having a vacuum manifold with a monitoring connection thereto comprising: a hollow, rigid casing, a pressure gauge mounted in said casing an

A fuel consumption efficiency indicator for use with a direct current power source having d.c. terminals of opposite polarity and an internal combustion engine having a vacuum manifold with a monitoring connection thereto comprising: a hollow, rigid casing, a pressure gauge mounted in said casing and having a movable member responsive to pressure in said vacuum manifold to deflect in one direction responsive to pressure increases and in an opposite direction responsive to pressure decreases, a hollow circuit leading from said pressure gauge to said monitoring connection, an electrically conductive pointer mechanically coupled to said movable member of said pressure gauge for movement and electrically connected to a first of said opposite d.c. terminals, a low vacuum electrical contact and a high vacuum electrical contact secured relative to said casing to transversely bracket said pointer at opposite limits of movement thereof, a first electrically actuated illuminator coupled between a second of said opposite d.c. terminals and said low vacuum electrical contact, a second electrically activated illuminator coupled between said second of said opposite d.c. terminals and said high vacuum electrical contact, and a third electrically actuated illuminator and a load coupled between said second and said first d.c. terminals.