Single position indicator gauge

摘要

There is disclosed an apparatus for indicating flow restriction in an air filter of an internal combustion engine, the apparatus comprising: an integrally molded base cap (32) that includes a reset button portion (64); a single locking extension (70) extending centrally from a major surface of the reset button portion (64); an annular portion (66) surrounding the reset button portion; and a single hinge portion (68) connecting the annular portion (66) to an edge of the reset button portion (64), wherein the reset button portion (64) can be pivoted at the single hinge portion (68) to rotate the single locking extension (70) relative to the annular portion (66).