Link two panels so that the time of the point of the #2 is the time displayed in the #1

Hi,
I want to create 2 graphs that have time dependant data.
The first one is a node graph simulating import export between nodes (got the data with an hourly timestep)
The second one is the net balance for one node (with also an hourly timestep)

As my node graph is able to only show 1 timestep at a time. I want to have the timestep displayed equal to the one of the tooltip of the second graph.

Reading forums, I think I should use data links but I do not get things to work

Thank you for your help