on the same wavelength

on the same wavelength (in agreement) — в полном взаимопонимании; одинаково смотреть на вещи; понимать друг друга с полуслова

Example: Writing the screenplay was easy because Bill and I were on the same wavelength.

see also
[see eye to eye with sb]
[on the same page]

opp,
[at cross-purposes]