FYI: I measured 12-13 lbs of boost on my 87 300SDL a week ago. I imagine that this is about what most of the mid to late 80's engines should be running for boost at WOT. The EGR should be closed down at WOT and should not make any difference in boost pressure at that speed if it is disconnected, or not..

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1985 300D - 190K Miles - 26 MPG on first trip home - getting rust fixed and repainted.
1987 MB 300 SDL - 238K miles - Sold
2003 DC Ram 2500 QuadCab 6 speed, 4x4 Cummins - 82K miles - 20+ MPG
1999 VW A4 Jetta TDI 5 speed - 83K miles - 50+ MPG is easy!