81 Maxim 650 wiring help

Hi all,
I am the owner of an 83 Maxim 750 that I've modded quite a bit, so when I saw someone selling an 81 Maxim 650 with a bobbed frame I thought... this will be easy! Well, needless to say this thing is going to require a TON of work to get going again, which is why I am asking for a little help. (and in ways to stay on a modest budget)
Mostly... wires!
As you can see all of the wires are pulled and it did come with the majority of the wires in a box, but I get the sense they were just cut and thrown in a box. I generally understand the wiring on a bike, and thought I could just mirror my 83 Maxim, but I think this loom is in pretty rough shape.... so I found someone selling an entire loom for a working '81 650 for $85. Should I buy this loom and just update what is needed or should I start from scratch and new everything? (still very much on a budget of course... the wife will kill me if I go to crazy with this)

If I do the wiring all myself, outside of the guage does it matter what kind of wires?

Thanks in advance for the help!

 

replacement harness would be best it may need cleaning and a few new connectors. rewiring the bike can get up in price with wires and colors.

you will want a flame proof wire melting is one thing burning is another

min wiring diagrams. also look in the xj4ever catalog it tells about wire sizes an where they are used
https://www.xjbikes.com/forums/threads/xj-parts-catalog-section-d-electrical-system.44641/