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Message: <blockquote data-quote="Ghostryder65" data-source="post: 519180" data-attributes="member: 35391"><p>I also have an older HF gauge and it is actually pretty spot on compared to 2 other gauges I borrowed to compare results. One thing that made a difference was using the rubber tip you have to hold tight to spark plug hole. It usually reads 5-7 PSI higher than the screw in hose type fitting. FYI Harbour Freights new lines of tools are really good compared to their old stuff. ICON=SNAP-ON, Hercules I believe=Milwaukee or Dewalt. The Bauer line is great. HF hires engineers away from the top brands and make the 7 changes needed to get past copyright/patent restrictions.</p></blockquote><p></p>