The cameras inputs to the silver switch-box are BNC connectors. They also have a threaded lock to keep them snug. Two of the three were not screwed on but were still making contact.
Here's my new 14" flip down monitor installation.
Flip down 14" monitor / DVD player installed over dashboard. https://www.rockvilleaudio.com/rvd14bgb/
Back up camera and left / right turn camersa are visible in the monitor running a piggy back RCA cable of the switchbox output and ran up under the trim on the driver's site to the overhead platform. Default view is rear view camera so I can keep an eye on our trailer toad.
I also have a HDMI input on the unit and I plugged in the Dual DMH25 DualCast Wi-Fi USB/HDMI Dongle so I can mirror my phone for Google Maps.