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The top outlet on WG goes to vent/waste. It is just a vent to let the diaphragm expand with no back pressure.
You can check WG in place basically - disconnect boost hose from IC, and pressurise from air bottle, compressor, whatever. If possible hook a Press gauge in the line and you will hear it open, and see the opening pressure on the gauge.
You dont even have to remove unit.
When car is idling, try wiggling the spade terminal on your overboost switch - see if can make it die.
You can also hook o/boost switch to pressure gauge and slowly pressurise, with multi meter on terminal and grounded from memory. It is just a switch, but should not operate before 1.1 bar. I think I just stuck a piece of plastic tube over the sensor end, with a gauge/tee piece in between and hooked air on it. To check my new one.
You may find it has gone a bit soft and triggering at 0.8 or anyplace inbetween. But if you do this test you can repeat as often as want til satisfied is 100% reliable.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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