The LQS custom made pressure gauge is a part of the Standard Single and Standard Dual Manifold Configurations for both Air Tool and Planter Implements.
See where they are included in Air Tool Manifold Configurations.

Made from 316 stainless steel 8 bar (116 psi) pressure gauge to monitor system pressure at the manifolds. Each gauge comes with its own stainless steel mounting bracket for fixing to the tractor.