Shouldn't need to do anything else to the sand, but if your pressure gauge is not working reliably, I would definitely change it out. Your filter may be too gunked up to do anything else until it's backwashed, but without the pressure gauge, you don't know for sure.
Edit for more info: If you do find that the pressure isn't rising, you can try to add a handful of DE (the type you use in DE filters) through your skimmer. It will help your filter catch some of the finer stuff. You need a working gauge to do that, though--you only want to add enough DE to raise your pressure by 1 ppm. That pressure rise can take up to 30 minutes or so, though, so if you add some, give it a little while before you add anymore. If the pressure gets too high, you'll need to backwash it out and try again.
Janet
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