There are a myriad of connectors that come out of that topper.
1. Control/power for the led strips on the side. (microfit Jr. type connector)
2. Control/power for the Super candle (microfit Jr. type connector)
3. Control/power for the two lights on top of the Super candle (service and trouble) White 4 pin square plug
4. Power to the monitor 8 pin molex minifit Jr connector
5. Vga cable for signal.
6. Braided ground strap
To power just the screen, you only need 12v I believe. The +12v is the pin just under the locking pin on the Molex and right under that is the ground pin.
USB is not used, typically a touchscreen, but obviously the topper doesn't have one.