Wiktionary
finger on the pulse
n. An active interest in the latest developments (of some topic).
Usage examples of "finger on the pulse".
In this way he not only kept his finger on the pulse of his tribe, but also gained invaluable knowledge of his advisors, for, often enough, they were more apt to reveal their true feelings out of his presence.
She was, after all, his new CPA, and he'd told her he was a man who liked to keep his finger on the pulse of his finances.
Appreciating the fact that his mother could always put her finger on the pulse, he grinned.
He thought he had a sure finger on the pulse of his chosen world, but he hadn't heard anything about the NATO hijacking.