Originally Posted by FBinNY

IMO absolute tension isn't super critical, and tightest isn't best. Years ago the range of tension was pretty broad, and anybody's fingers could be calibrated accurately enough.

These days however, rear wheels will often have left side tension of about 60% of right side tension. That narrows the working tension to a narrow zone between what will be too loose on the left and too tight on the right, or often both at the same time.