I asked this question a year ago and I've concluded that 'to' completes the meaning of 'from'.
... took care of him from cradle to grave
... went from poverty to fortune
... everything from A to Z
... flew from Canada to Mexico
Analyzing it as a single constituent instead of two separate PPs acting independently simplifies things. I'm calling 'from-to' a correlative preposition that describes movement between an origin and a destination and functions as an adjunct or complement of verbs and nouns.
Yes, I made that up, but there's no other reasonable way to analyze it.
Walmart sells everything from garden tools to household appliances.
In this sentence you see that from and to cannot be independent PPs.
You can't reverse their order:
everything to household appliances from garden tools
You also can't leave one out:
everything from garden tools.
From-to is a constituent, a two-part PP that's functioning as a complement of everything.