on the same wavelength
(idiomatic) In rapport or complete accord.
Luckily, the members of the committee were on the same wavelength, so we didn't have endless discussions about what words meant.
Know that your work speaks only to those on the same wavelength as you. Jean Cocteau
The players fire the coach, and as long as I'm on the same wavelength with them, I can coach as long as I want to. Woody Hayes