key into

verb3

1. •
   To put (someone) into (a particular state, emotion etc.).
2. •
   To make (someone) focus or concentrate on (something); to make (someone) understand.

   • Walter wasn't on the same page as the rest of us at first, but we talked about it and keyed him into it.
3. •
   To cohere with; to accord with, to be in keeping with.