The invention relates to the alignment of motor vehicle wheels and axles. A first embodiment is disclosed for an apparatus comprising a means to hook over an adjustable mounting shaft on a steer wheel providing at least partial rotation thereof, a transverse suspension member attached to the hanger with a light source retained in a bracket and rotatably mounted on a non adjustable mounting shaft at one end thereof and a counterweight at the other. The connections of the hook means and the light source bracket to their respective mounting shafts are such that the mounting shaft is held between a clamping means and two points on each side of the hook means and light source bracket respectively. The clamping means disclosed is a threaded member with a spring loaded ball in one end which engages a circumferential groove on the respective mounting shaft. The second embodiment substantially comprises the light source bracket of the first embodiment adapted for mounting directly onto a directionally adjustable mounting shaft attached to a non-steering wheel of a motor vehicle. Preferred embodiments use laser light sources and include a calibration means to vary the orientation of said light source.