by geeves » Wed Sep 07, 2011 3:00 pm
Looking at them I doubt it matters. The top 2 are teed together so are the same. The bottom 2 go to activate either one or both EGR valves. These are just vacuum switches it doesn't matter which way the vacuum goes through and it doesn't matter which EGR works first.
Sanding your knuckles before starting work can help. That way you cant skin them