Vehicle Speed Issue
1999 Ford F250 Super Duty 6.8L, 4x2, RWAL
P0500-verified concern with scanner, vehicle speed signal dropped out periodically. GEM, ABS and speedometer never lost speed signal.  After checking connection at PCM PIN 58, I back probed PIN 58.
I expected to see a digital signal but the scope image was not what I expected to see.
I this post work I will continue description.