She has her finger on his pulse. She knows exactly what he wants

[alpacinou]

Have I used the idiom "finger on the pulse" correctly and naturally in these sentences?

1. She has her finger on his pulse. She knows exactly what he wants and what makes him tick.
2. Jimenez is a shrewd politician. He has his finger on the pulse of the nation and he's good at wooing on-the-fence voters.
3. I need an office manager who has his finger on the pulse of the industry all the time and can keep up.
4. If you want to succeed in this job, you need to have your finger on the pulse by keeping in touch with the right people. And when something new comes up, you should put out feelers and find out what's going on.

 

[5jj]

The second and third are fine.

The first does not work for me. It could sound as though she literally had her finger on his pulse.
The last one does not work for me, either. On the pulse of what?

 

[SoothingDave]

When used metaphorically, it is used on something abstract, not on one person.