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<iframe width="600" height="338" src="//www.youtube.com/embed/Ty58XJU-RYU?rel=0" frameborder="0" allowfullscreen></iframe>

Summary of the above video:

Zoom in on the rosette/rectangle you just created

Go to the Draw menu and select Construction point at the very bottom of the options

Click on the edge of the longer side of the rectangle, but preferably so it does not snap to the middle of the edge

Click on Constraint menu > Midpoint > click the edge and the Construction point

Also put a midpoint on the opposite long side of the rectangle with the same method

Click on Draw > Line > click on two Construction points on long edge

Apply another midpoint to the newly created line (that midpoint is the middle of the gauge)

Go to Modify Menu > Copy > highlight all edges and middle point > Paste 

Paste two figures > right click > End

With the midpoints correctly defined and being static relative to the gauges, we specify their distances in the coordinate system centered at the front face of the support hole.

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