I'm running the following on my SuperSTOL. Just a car backup camera split to feed both my G3x screens.
Backup Camera
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Cable Splitter
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Adapter
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1