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It looks like the kind with a calibrated leak to adjust the pressure reaching the wastegate. You should be able to plug one side and blow in the other and have some air come out the hole on the side. If this is the case, you can install it in either direction on the line going to the wastegate. Start by closing the valve all the way then make a run to determine your boost level. If it's not high enough, crack the valve open a little then do another run and note any difference.
Just keep adjusting and testing until it's right.
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-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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