| 摘要 |
A two stage air filter restriction indicating device communicates with the supply of air passing from an air filter to the air intake of an engine. The amount of vacuum required by the engine to supply air is directly indicative of the amount of blockage in the air filtering system. The gauge or air filter restriction indicating device monitors this vacuum level and provides signals at an output indicating whether a predetermined vacuum level has been achieved. In one configuration, the gauge locks into this configuration and maintains its output, even when the engine is shut off. Alternatively, the gauge of the present invention automatically resets, thus not requiring a manual reset of the gauge.
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