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If you are feeling "strong" flow from the returns and your filter pressure is close to 0, then there are only two possible explanations.
1) You are running on low speed of a VS or two speed pump that you failed to mention. This is normal.
2) There is still something wrong with the pressure gauge.
Thanks, Mark. I am definitely running a 1 sp / 1HP pump. Since I replaced the pressure gauge, I guess I'll replace the release valve too. (The gauge screws in to the top of the valve on my filter.)
One thing I did fail to mention is that I have an attached heater. I've never used it so I sometimes forget it's there. Would anything there be a possible cause?
No, the heater would not cause that problem. Heaters cause filter pressure to rise, not fall.
If you are feeling strong flow out of the returns, then it is most likely something to do with the pressure gauge and/or location of it.
Here's a crazy idea: Could the passage to the pressure valve be partially blocked? If so, it would read low pressure, even with a new valve, yet the pressure at the returns would "feel" normal.
remove pressure gauge and turn on pump an make sure there is flow out of PS hole it could just be plugged