sending signals between two different instances of two different classes?

[ChrisW67]

so then it's not bad practice to have connections in main()? If not, then I guess my problem is solved.

There's nothing in my response and nothing in your question regarding main() or where you should/should not connect objects.

As Wysota says, you generally connect objects from somewhere outside the objects. If main() is the logical place to do that then do it there.