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Filter Minder® Visual / Mechanical Indicators & Gauges

Filter Minder® Threaded Mount Gauge

Air Filter Restriction Monitoring Gauge

Graduated Indication / Threaded Mount


How it Works

The Filter Minder® Threaded Mount Gauge monitors engine air filters. The position indicator progressively fills the window as air filter restriction increases, locking at the highest restriction. The air filter should be changed when the position indicator reaches the red zone.

The Filter Minder® should be reset whenever the service indicator is checked to determine air filter restriction or when a new air filter is installed. Push the reset button at the end of the service indicator, and the position indicator will return to zero.

Filter Minder® Air Filter Indicator - Threaded Mount


133501 (Stem for Grommet Mount)
135501 (1/8-27 NPT)
136501 (3/8-24 Straight Thread O-Ring)
137501 (M-10x1 Straight Thread O-Ring)


Mounts directly to air cleaner or air induction piping. Adapter fittings and grommets are available.  Brackets for remote mounting are also available.


  • Vacuum Indicator (differential and pressure available)
  • Locking Type (non-locking is available)
  • Operating Temperature: -40 to +250°F (-40 to +121°C)
  • Accuracy: ±10% at red zone
  • Material: Polycarbonate housing
  • Standard Calibration: 8-35" water vacuum (2-8.7kPa) at the red zone


  • Length - Threaded:  2.8" (72 mm)
    Length - Stemmed:  3.3" (85mm)
  • Diameter:  2.0" (50mm)


A Few of Many Industries Served

Air Filtration Markets Served


  • Can be configure to measure pressure, vacuum or differential pressure

  • Durable, heavy-duty design

  • Private labeling available

  • Multiple mounting configurations

  • Resistant to under-hood chemicals


  • Maintains last recorded level of filter restriction

  • Allows for full use of filter capacity

  • Reduces down-time and aids in maintenance planning
  • Reduces ooperational costs for end-users