Abstract: A template for determining whether an auto radio unit can be installed in an auto dash having a dash opening of predetermined size and two shaft-receiving openings spaced on opposite sides of the dash opening. The template has a main opening corresponding in size and profile to the portion of the auto radio intended to extend through the dash and has two minor openings positioned on either side of the main opening in the same relative relation thereto that the shafts of the radio occupy with respect to the portion thereof extending through the dash opening. By placing the template against the dash with its openings aligned with the dash openings, it can be seen whether the dash openings are of sufficient size and correct positional location to receive the shafts of the radio and the portion thereof intended to extend through the dash.