This is a good tool to easily check if the power valve is good or bad - it's still very hard to tell what the power valve pull adjustments are when you're running 7.5psi and 3 .5 psi test. then you can visually see the difference in the movement of the valve with more or less vacuum, but it will be difficult to tell exactly when it closes - 4.5psi and 3.5psi cannot be seen because one is one .
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