So when I moved in the pressure gauge was already pretty old but I never thought it maybe bad, after couple of season of it never changing the values really I decided to replace it. My pool was always pretty clear and not much stuff gets into the baskets. I bought a brand new zodiac pressure gauge this year and I noticed the same thing, the pressure never changes on this thing, really It might have dropped very slightly. I did have a small algae outbreak when I shut off my chlorinator production for a few days by mistake but it cleared up very quickly when I shocked. Even with that I thought it would raise the pressure at least a bit. I think the gauge run for at least 2 months without any pressure change. Can it be another bad one? or something with the filter?