HELP!!

I'm about to pop! I cannot seen to locate a idiot proof wiring diagram showing the under dash setup for a standard gauges. If anyone has a good pic I would be eternally grateful.

There are several factory connectors each with 3 female barrel connectors and I cannot determine what is what.. MOST frustrating!

End result I am trying to figure out:
1. why the dash lights are not working.
2. Where to get switched 12v power for a radio.
3 where to get 12v dash light power for additional auto meter gauges.

Thanks y'all!!