The best system I've seen is from Isis (link bellow with link to episode that I learned about the company). I know you can also get something from painless wire, and Edelbrock. I think you will find a lot of companies that have products for this.

You were also mentioning other systems like the lights going out, a lot of times the connectors are worn out the connector blocks. You can get new blades for the connectors, and replace the old ones this helped me out big time.

ISIS Intelligent Multiplex System - Automotive Wiring Harnesses, Car Wire Harness, Engine Wiring Harness, Auto Wiring Harness, Truck Wiring Harness, Car Wiring Kits

TGG 803 ? Super Wiring | Two Guys Garage

Figured out what the Y and B/Y wires that the red arrow points to do. These are wires for an electronic fuel pump harness. They run inside to a relay on the passenger footwell area. There is another relay in this harness and an inline fuse located in the center console. I ripped it all out.