If your pump gauge seems sketchy and you are worried about overfilling do short bursts and check with a stand alone gauge to learn how your setup reads... After one session you will know how much to trust the pump number and you can inflate straight to the target without guessing.
Another small safeguard is to listen to the pump as it nears the end. It labors a bit in the high pressure stage and the needle should be near the board rating. If it ever goes past the max, stop and tap the valve core to vent a second. No stress.
