Air Filter Restriction Gauge

[klroger]

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I installed an air filter monitor on a bracket I made to fit in the V shaped unused holder that is on the bulk head of our cars. This way I can monitor & make sure I have the maximum life of the air filter used & not just someone telling me to change it because it looks dirty.. All the transport Trucks I worked on when I did Fleet maintenance had them & the filters didn't need changing until the monitor was in the red zone. (~ 2" WC differential over the filter..) I have had these on my last 3 vehicles & it's easy to see the state of the filter, just look @ the monitor...