wiring advice needed

Thats a thought I had if I was to try and save the existing wiring, or whats decent but I was unsure of how to be sure I was replacing the wires with proper gauged wires..I am sure whats connected now is not as I can see where in 1 run the wire changes sizes a few times. Unless I could find a diagram stating what gauge wire for where I wouldnt know how to get started that way.

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Factory Service Manual will have all wire gages, and colors used for each circuit. Some circuits you may want to change & increase gage to reduce voltage drop such as charging wire to battery, relay feed headlights, and others would fine to keep factory sizes. We can advise when asked.

The point is that by working one circuit or in other words one wire at a time, leaving the old wire in place until replaced greatly reduces confusion. In other words your project could proceed as follows:
1. Renew oil pressure circuit; remove old wire, mark off on diagram.
2. Renew coolant sensor circuit; remove old wire, mark off on diagram.
3. Renew wire from power lug on alternator to bulkhead connector, or perform charging conductor amp gage bypass and increase its gage size.
4. Renew ignition wires from bulkhead connector to 12 volt side of ballast resistor; remove old wire, draw in any change made in this circuit on diagram.
5. Ignition wire from low volt side of ballast to coil; remove old wire, mark off on diagram.
6. Renew “start: circuit ignition ballast bypass wire, remove old wire, mark off on diagram.

And so it goes, one thing at a time, using good wiring methods we can discuss how to perform later on, and which tools and materials will be needed.

By keeping track of your progress on wiring diagram, you will develop a full understanding of what has been done as well as its physical location under hood, and how to read any wiring diagram. Also you can easily pick up the next day where you left off.