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The light sensor comes with a mounting ring/socket that can be installed for surface mount applications (through the dash pad or the package tray for example), but since we were placing the sensor behind the rearview mirror, we left the mounting ring off to keep the installed size small. The few inches of exposed wires will be wrapped in electrical tape or PowerBraid. We got lucky with the alarm's shock sensor retaining the light sensor for us, but you could just as easily tie-wrap the sensor to the rearview mirror stem too. Another good location for the sensor is at the corner of the dash where it meets the A-pillar.