A device for detecting a movable internals in an automobile gearbox is pivotally mounted relative to the gearbox housing (13) in a shaft ((a) pivot position between two distinct angular positions and includes a target including a magnet (() 26). And internal elements (10And a related fixed magnet position detection sensor ((28), which provides a signal (() 26) indicating the change of target angular position relative to the sensor (() 28,It is characterized in that it includes a measuring circuit, which is used to measure the change of the field line distance emitted by the magnet.Relative to the relevant sensor(
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