Replacement wiring harness

Frankly as "unMopar" as high priced stuff like Painless is, some of these "no brand" 12 circuit setups might make sense.

You need a shop manual which you can get. This is so you can figure out stuff on the "factory end" like your gauges, light switch, etc. You can download many of them free from MyMopar

Many of the connectors.......you can rebuild. Many of the connectors use "Packard 56" terminals which are available. Be careful you get the proper Mopar kind, there are some variations

"Little things" like wiring up the gauges we can help you with here. That is not that difficult.

I would do away with the bulkhead connector. I was able to make a SIMPLE metal panel to replace my connector, which snapped right in with a replacement gasket and factory snap retainers