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This utility model relates to a differential pressure gauge mounting structure for a static pressure chamber. A differential pressure gauge is installed on the left side of the static pressure chamber shell near the top. The gauge is mounted on a mounting plate, which is then connected to a mounting recess in the static pressure chamber shell via the mounting plate. The gauge dial is mounted on the front side of the mounting plate, and the gauge body passes through a through hole and a rear guide housing before extending into the static pressure chamber shell. Positioning grooves are provided on both sides of the mounting recess, and positioning protrusions matching these grooves are provided on both sides of the rear side of the mounting plate. This utility model first mounts the differential pressure gauge on the mounting plate, then mounts the entire structure onto the static pressure chamber. This ensures timely replacement and maintenance of the gauge regardless of whether the panel has an inspection window.