Hewitt's traditional combination vacuum/boost gauge manufactured for decades. Tried and true. White letters on black face with red pointer and black bezel. Hewitt Industries Vacuum / Boost pressure gauge is provided with a range of 0 - 30 Hg and 0 -30 psi. Vacuum is negative pressure. Boost is positive pressure. This Vacuum / Boost pressure gauge is a combination gauge measuring both vacuum and pressure in one easy to read gauge. The Vacuum / Boost pressure gauge comes with a standard 8 ft. long pressure hose along with the appropriate fittings. Engine vacuum is a great diagnostic tool. It can be used to diagnose vacuum/boost leaks, idle problems, low compression. The list goes on.
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