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Originally Posted by Jeremy5848
Craig, what kinda plastic is that line made of? I'd like to put a tee in the line so I can permanently install a vacuum gauge to monitor vacuum pump health. The gauge could mount on the inner fender, I don't need to see it while driving. If the wall thickness of the plastic line would allow it, I could even drill/tap in a fitting but I don't want to break it and have to buy a new one for fifty bucks (as you know).
Jeremy
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I don't know exactly what it is, but it's very hard/stiff. I have not kept any old ones to cut up. I don't think I would mess with it, it's easy to connect a vacuum gauge to the small line that leads to the door locks. I would just unplug a small line and connect a gauge when I wanted to check the pump performance. If you want to experiment, try getting one from the junkyard.