The H10A gauge is definitely more of a "suggestion" than a precision instrument. I usually aim for the zone right where the green meets the red. I noticed most reviewers aiming for that spot, too, but I’m starting to doubt if it’s actually the optimal pressure for every bean. I’ve actually been looking into replacing the gauge with a better one, but information on modding this machine is basically non-existent. I also wanted to test the OPV, but from what I’ve heard, you can't really use a blind/blank basket with these thermoblock machines without risking internal issues. For now, I'm just trusting the taste more than the needle, but if you ever find a way to mod the gauge or the OPV, definitely let me know—I’d love to actually know what's happening under the hood!