Replacing welded splices on dash harness

Thanks guys, the only reason I was contemplating is some of the orange wires getting stiff near the terminal ends.
I was concerned with increased resistance due to brittle wires.
I have quite a few harness' to pick/choose from. Unfortunately some arent just a simple swap.
Pics of orange wire/splice and a few more splices. "Oddball" ends on some wires make it a challenge.
Thanks.
If they are tight, show no corrosion I would leave it be.

the splices are probably the least likely to cause problems.

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