I only used it as a vacuum gauge to set the idle screws in my truck's carburetor after it was repaired. It seemed to give reasonable measurements and I was able to use it successfully to set a screw. I cannot assume any liability for the other properties. It's worth noting that it only comes with one hose and is a bit oversized. I had to add a small hose clamp so it will seal snugly on the barb fitting on my intake manifold, which is sized to fit a hose that is about 1/8" ID.
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