Profile: Western Pegasus is a full service supplier of customized spline gauges, master gears and spline related inspection gauging. We supply gauges globally to leaders in the automotive, aerospace, agricultural and marine industries. Our concentricity gauges are used to assist in assuring that certain diameters are concentric, or a face is square to the spline pitch diameter. It is a segmented design of three splined rings, with two outer rings fixed, and the central ring rotating to lock onto the component. To obtain a quantitative value, a dial gauge is set onto the concentricity band of the ring, and the component rotated.