I did something really (2) important today!! (Reflux pump in the middle of the absorption tower, pressure gauge) + problems

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My position is assistant operator for reactions. This month, our responsibility area is Tower 4 for absorption and stabilization. I started my night shift early this morning; before starting and ending the shift, I cleaned the area in preparation for an inspection. After working hard for most of the day, just as it was time to hand over the shift, I suddenly noticed that the pressure gauge on the backup pump located in the middle section of the absorption tower – an earthquake-resistant pressure gauge – indicated 1.2 MPA, and its pointer hardly moved at all. Even when I closed the manual valve on the gauge, no pressure was released... I thought that the gauge must be broken and unable to return to zero. I got a new gauge and tried to replace it. During the replacement process, some oil came out, and the gauge did return to zero. It was then that I remembered: the pressure inside the absorption tower is already high, and so is the pressure at the pump’s inlet! I was completely confused! I used to work with distillation; now I work with reactions, and I have little experience with stabilization processes. I still hold old-fashioned views on this issue – it seems I need to learn more. Understanding things from various perspectives is key to becoming proficient in one’s job. But then I thought that maybe the gauge itself wasn’t functioning properly and couldn’t return to zero. In a way, this was also a form of inspection. Hehe... Now, considering all the pumps used for stabilization, most of them have relatively high inlet pressures. Of course, there might also be some gauges that are broken (with pointers that don’t move), especially those on backup pumps, which are earthquake-resistant and have pointers that hardly move at all. How can this problem be resolved? Should I try closing the inlet valve of the backup pump? I think it would be good to install a small drain valve on each gauge of those pumps with slightly higher pressures. This would help prevent freezing and condensation, and it’s easier than having to remove the valves altogether. Hehehe...