Bolt torque discussion

I did some rod bolt torquing today and that is where I throw everything I think about bolts out the window. Now we go by the book. Here was my dilemma. I bought a used set of Crower Rods and assembly. No other marketing on the rods bolts other than Crower so I measured the bolts and that are around 1.800 long- 7/16. The specksheat says 65 pounds .004-.006 stretch with 20-50 oil. The next bolt down calls for 75 foot pounds .005-.007 stretch with their lube. I decide on aiming for a hair over .005 with 20-50 oil. 72 foot pounds is my number for this build.
If you don,t mind can you describe your procedure on how you use the stretch gauge on a 7/16 bolt. Do you set the gauge
To zero and then torque with gauge removed or gauge in place and use a box end wrench.
I found I had to change my procedure with 7/16 bolt versus
a 3/8 bolt because of the torque requirement too high to get with a box end wrench.