An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly having a field of view rearward of the vehicle when the interior mirror assembly is attached at a portion of the interior of the vehicle. The interior mirror assembly includes at least one pivot element enabling a driver of the vehicle to adjust the rearward field of view of the reflective element to that driver's desired setting and the interior mirror assembly comprises a mirror support having a mounting portion for attaching the interior mirror assembly to the portion of the interior of the vehicle. The mirror support includes at least one pivot element and the reflective element is disposed in a mirror housing. Electrical circuitry that includes a microprocessor and a compass sensor is disposed in the mirror housing behind the reflective element such that adjustment about the at least one pivot element by the driver to set the rearward field view of the reflective element moves the electrical circuitry in tandem with movement of the reflective element.