An adjustable alignment apparatus for a gage that fits to a vehicle body includes a base having first, second, and third abutment faces and an adjusting plate having first, second, and third walls respectively spaced from the first, second, and third abutment faces. An adjusting bolt acts between the base and the adjusting plate to move the walls of the adjusting plate respectively toward and away from the walls of the base. A first mounting bracket engages with the vehicle body and is attached to one of the base and the adjusting plate. A second mounting bracket engages with the gage and is attached to the other of the base and the adjusting plate. A plurality of shims can be removeably installed and uninstalled between the abutment faces of the base and the walls of the adjusting plate to adjust the position of the gage relative the vehicle body.