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[[Image:SMOKE01.jpg|thumb|150px|30 psi Boost Gauge]] A '''boost gauge''' is a dashboard mounted instrument that indicates [[turbocharger]] or [[s

.... It was first introduced in the mid 1860s and a variant, the '''automatic vacuum brake''' system became almost universal in British train equipment, and in ...n in the [[United States|USA]], primarily on [[narrow gauge railway|narrow gauge railroad]]s.

...ss valve''' ('''CBV''') also known as a '''compressor relief valve''' is a vacuum-actuated valve designed to release pressure in the intake system of a turbo ...ld]] ''after'' the throttle plate. When the throttle is closed, [[manifold vacuum|underpressure]] develops in the intake manifold after the throttle plate an

...ng the carburetor draws more fuel into the carburetor due to the partial [[vacuum]] that is created. ...losed butterfly valve. This [[manifold (automotive engineering)|manifold]] vacuum is sufficient to pull fuel through small openings placed after the butterfl

Measuring the compression [[pressure]] of an engine, with a [[pressure gauge]] connected to the [[spark plug]] opening, gives an indication of the engin ...unit)|bar]]. (× 14.7 psi at sea level = 201.8 psi. The pressure shown on a gauge would be the absolute pressure less atmospheric pressure, or 187.1 psi.)

...ly and quickly come to a stop from high speeds. The chassis, made of heavy gauge stamped steel, had a standard [[wheelbase]] of 145.6 inches but could be st

* First vacuum-assist [[power brake]]s - 1928 [[Pierce-Arrow]] * First dash-mounted fuel tank gauge - 1914 [[Studebaker]]