The Rear View Safety Backup Camera System with Flush Mount Camera # RVS-7707721 can be connected to be always on as a rear view monitor option. Because you are looking to replace your rear view mirror, you may want to consider the Rear View Safety Backup Camera System - Mirror with Monitor - Flush Mount Backup Camera # RVS-772718. This option will be a smaller monitor, but it will also not take up additional space elsewhere. The 7 inch monitor system does come with a wiring harness so... view full answer...