Video pull up and down does not affect the Timecode ruler. Be sure to set the session Frame Rate to the correct frame rate for your project. For example, if working with 24 fps video and you pull the video up by 4%, switch the session Frame Rate to 25 fps to keep the Timecode ruler aligned. Similarly, if working with 24 fps video that is pulled down by 0.1%, switch the frame rate of the session to 29.97.
When working with 25 fps Avid media and the video is set to pull down by 4%, set the session Frame Rate to 24 fps.