The gauge on my Sand Dollar doesn't rise above 18psi. The normal operating pressure on my clean filter (according to this obviously defective gauge) is 16psi, so at most my pressure gauge rises 2psi when the filter is dirty. I'm certain that the pressure does go above this, but the gauge is not registering it.
The way the filter was installed, I can't see the gauge anyway without crawling under the deck. In order to correct this, I'd have to re-plumb the whole setup (PVC) to turn the filter head around, which I can do, but I don't know if it's worth the effort. Another option would be to re-plumb the gauge so that it is piped out around the side of the head instead of being directly mounted. (Note that I'm going to be doing a little bit of re-plumbing on this this winter to fix an issue with my backwash plumbing.)
This summer, I based my filter cleaning on pressure at the return. When it felt like I'd had a significant drop in return pressure (and the current significantly decreased,) I knew it was time to clean the filter.
Since I would have to re-plumb things, is it worthwhile to bother with a new gauge. Is it that important to know what the pressure really is?
Is this a standard pressure gauge that I can get from someplace like Lowes? If not, any ideas where I'd find it? Specialty plumbing store?