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For about 5 bucks you can glue a magnet to any mirror made, then angle it so you can see the dial as you use it. All of mine have the movable pointer so you can preset the amount you want to torque to and then just use the mirror to see when the needle touches the pointer.
The mirror trick may work with 150#, but unless you are a 300# fellow with young eyes, that 450# mark on a bolt requires a long enough extension I can't read the needle, even if I can see it. Vertical bolts make it even worse.
My Dad and Uncle spoke of torqueing the Prop retainer nuts on the old DC 3s Wasp Engines, no spec listed just a Prop nut wrench a 10' pipe and a 160 pound man, when the wrench and nut stopped turning was torqued, later he found was 1600 lbs.