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Basically you have a tube that goes from the intake pipe to the gauge. The plunger and spring are in the gauge. The tube on my truck appears to be clear nylon. Mine does work, although I don't know how accurately, because it sits right below 8 on the scale. If I hit the reset button on the...

The filter gauge works off vaccum (the variable), being pulled against a plunger in the gauge, which depresses a spring (the constant). The more vaccum, the higher the restriction if everything is working right. There is a hose that connects the gauge to the intake pipe. If this line leaks then...