Variable reluctance linear position sensors and switches are non-contact devices. Variable reluctance sensing incorporates a "spring" of elastic, highly magnetically permeable material surrounded by two coils. Variable reluctance linear position sensors and switches use strain-based technology, wherein a magnetic circuit is formed, and the parameter input causes mechanical deflection of the spring member as a function of pressure, force, or acceleration. The deformation, strain, or displacement of the spring results in modulation of the inductance of the two coils, and this is read to indicate force, pressure, position, or other input to the sensor.