I recently replaced one junk psi gauge with another sold by a local pool store. The new one doesn't move higher than 2psi from the pressure immediately after backwashing (20-22 psi). A week or 2 later the gauge reads 2psi higher but i notice a substantial flow decrease out of the returns. Can someone recommend a decent brand or vendor? It needs to be a back mount and the only ones i have found at Lowes/Home depot are all bottom mount. I don't mind paying a little more for quality. It's a pentair sand dollar BTW.