Response to Hello David.  Attached please find an exploded parts diagram for the Pentair Triton II Fiberglass Sand Filter.  Please note part Keys 3A and 3B.  The pressure gauge selection, rear mount or top mount, is dependant on the version of the filter model.  Technically either pressure gauge will fit, as they both have the standard 1/4" pipe thread for attachment.  The orientation of the face will differ.  Match your current pressure gauge to either 3A or 3B.   Pentair Triton II Fiberglass Sand Filter

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