Response to Hello Cindee.  The Pentair Filter Pressure Gauge w/ Indicator Rear Mount, OEM - 190059 is a compatible replacement pressure gauge for the Pentair Sand Dollar 40 Filter.  The Back Mount Pressure Gauge 0-60 1/4" NPT REAR/BACK (102D-204D) is an aftermarket replacement pressure gauge compatible with the Pentair Sand Dollar 40 Filter.  Attached please find the Pentair Sand Dollar Filter exploded parts diagram for reference.

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