Abstract: A dual gauge system determines pressures of two separately contained gases by use of two separate pointer—Bourdon tube sections within the dual gauge. The Bourdon tube of a first one of the sections is gaseously coupled to a first one of the contained gases to determine pressure of the first one of the contained gases and a Bourdon tube of a second one of the sections is gaseously coupled to a second one of the contained gases to determine pressure of the second one of the contained gases. Accuracy of pressure determination is enhanced by allowing for separate calibration of each of the two gauge sections.

Abstract: A pneumatic load measuring device for vehicles having pneumatic or air suspension systems includes a pneumatic pressure gauge calibrated to indicate the weight of the vehicle. The gauge is installed in the cab of the vehicle, where it is visible to the vehicle operator, and is connected to the pneumatic suspension system of the vehicle. The gauge may be calibrated to indicate the weight of the vehicle supported by the air suspension system, either in pounds or using the metric system. The gauge may be marked to indicate the maximum allowable weight of the vehicle, if desired, and an adjustable scale may be provided for the cargo weight. The zero point of the adjustable cargo weight scale is positioned opposite the empty weight of the vehicle, so both the cargo weight and total vehicle weight are displayed on a single gauge. A visible and/or audible annunciator may be provided to indicate when the maximum allowable weight of the vehicle has been reached during loading of the vehicle.