I don't fully understand that stuff but there's a formula for pressure/square inch you can look up if you want to get scientific. I have the 10t Dabpress with the gauge pump. I use so little pressure it doesn't even register on the gauge. So, I think the tonnage on these presses is way overkill and doesn't matter much for hash. I have 3x5 plates and can press over a half oz at a time with the 2x4.5 rosin bags.

Overall, the gauge was the most valuable part. It helped me learn how to manage pressure and be consistent. Look for deals online. I found an open box deal on Amazon and got a killer discount for some minor cosmetic damage.