"At about 11:00 a.m. on July 3, Stuart reached Cress Ridge, just north of what is now called East Cavalry Field, and signaled Lee that he was in position by ordering the firing of four guns, one in each direction of the compass. This was a foolish error because he also alerted Gregg to his presence. The brigades of McIntosh and Custer were positioned to block Stuart. As the Confederates approached, Gregg engaged them with an artillery duel and the superior skills of the Union horse artillerymen got the better of Stuart's guns."
There would be no need to signal Lee if he weren't expected to coordinate movements.
What record? Lee was on the west flank of the line of ridges that made up the Union Position during Pickett’s assault on Cemetery Ridge . Cress Ridge is to the East of that line of ridges, including Culp’s Hill. Did Stuart have signalmen on Culp’s Hill to relay messages?