Wheel Bearing and Race

The cavity between the 2 bearings is a resivoir for grease. I pump a donut of bearing grease there in a new hub. Preload on new timken taper roller bearings is 7 lbs and 5 lbs for used bearings.Or is it 5 and 3 ? I forget. Nobody uses the load gauge anyway. Just rotate the assembly while snugging the nut. What feels too tight to you probably is too tight. A feel for it comes from experience.