Apparatus for digitally displaying inclination of a lift truck mast includes an inertial inclination sensor carried by the mast and a digital display module for operator viewing remote from the mast. The inclination sensor includes a disc pendulum pivoted for damping its movement, the disc having a wand extending from it for exaggerated movement about the pivot. A plurality of light responsive devices are provided for detecting the position of the wand for the purpose of determining the degrees of actual mast inclination with respect to a true vertical gravitational plumb line. A logic circuit interconnected with these devices decodes signals resulting from a predetermined pattern of illumination on them produced by the wand representative of the mast inclination, providing an encoded signal which is converted to display drive signals for driving a plurality of digital display devices of numeric readout, providing operator display of the actual degrees and increments of degrees of mast inclination from the vertical plumb line.
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