An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly and a control having control circuitry. An information display is disposed behind a transflective reflective element to display information that is viewable through the transflective reflector by a driver of a vehicle when the information display is displaying information. A mounting structure mounts the mirror casing to an interior portion of the vehicle, and the mirror casing is adjustable relative to the interior portion of the vehicle via at least one pivot element of the mounting structure. The control circuitry includes a photosensor and the control controls dimming of the electrochromic medium responsive to detection of light by the photosensor. Electrical wiring connects to at least a portion of the control circuitry that is disposed within the mirror casing. The electrical wiring passes through the pivot element of the mounting structure.