Tapped it and it just stayed the same...water level is good so I guess it's just working extra hard...lol. My pump has been on for almost 4 weeks non stop. If there is floc still lurking is it going to mess up my filter and sand??..seeing how I just changed out my sand I hope I wouldn't have to do it again.The pulsing might be caused by low water level.
Try snapping the gauge with your finger a few times. That might move the needle. But there could still be floc lurking. If you have good flow in the skimmer and out the return, just leave it filter.