The hughes 426 kit I recently did, all but one bolt was within stretch specs at 63-65 pounds, I kept bumping the TQ a bit at a time because that one bolt would not go past .004 so I used a new bolt on that one.

I also checked them all at 50 pounds to see if they had equal stretch, all did but that one mentioned.

Right or wrong this works for me, I feel without the way to check the stretch that one rod bolt might of caused some issues down the road.

The gauge is semi easy to use, just use it the same way on every bolt.