Torque wrench won't give you a pressure/PSI reading. Strangely enough, torque wrenches are for torque, measured in foot-pounds or newton-cm or whatever. To determine a thrust (pounds, not PSI) you'd need to know stud radius, thread pitch, and friction (both static and dynamic). Accuracy will suck and isn't worth the effort.
A better method would to be directly measure the springs. Load the spring with X pounds of compression and measure the resultant length with a micrometer. When mounting a block, compress the spring to that predetermined length.
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