There are two switchover valves behind the headlight. One is for the EGR valve, and the other is the airpump diverter valve. One line should have a 1" round restrictor in the line going away from the switchover valve, that one is the EGR valve. Don't confuse the restrictor with the check valve on the vacuum feed line. The check valve should be blue and feed both switchover valves, the restrictor should be green going to the EGR valve.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff