"To feel the vibration" means to sense or experience the subtle rhythmic movements or energy that can be felt physically or emotionally. Full definition
From feeling the vibrations of your vocal cords to touching different fabrics around the house. (besttoys4toddlers.com)
If you can not feel the vibration in the steering wheel it is unlikely that the problem will be related to wheel balance or alignment. (mechanics.stackexchange.com)
It features a belt clip that makes it to wear it around and feel the vibration when there is an alert. (babieslounge.com)