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Originally Posted by 1983/300CD
There is a plug in it right now, but it can be taken out. From what I hear, that is the proper place to test the intake manifold pressure. Sorry, don't know the thread size.
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It is 10 x 1.0 mm. Go to an auto parts store and get a 10 x 1.0mm brake bleeder valve - it already has a handy place to ayttach the pressure tubing.