The threads are tight as mentioned in some other documents but I didn't have to put them through a die and they still have a coating. I screwed it in by hand and pressed firmly against the o-ring, and the hose is flexible enough to bypass the rocker arms. At the top of the "glow plug" is a Schrader valve for accurate readings. I've used this with a Lang Tools TU-15 diesel tester with no problems, but the quick shutdown is a bit different.
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