We recommend installing either a ball valve or needle valve in-line for gauge isolation.
Product Attachment
Product Data Sheet,https://woe.kendallgroup.com/woeb/pdwimages/jogattachments/ashcroft-datasheet-commercial-1008-a-al.pdf|Installation and Maintenance,https://woe.kendallgroup.com/woeb/pdwimages/jogattachments/ashcroft-manual-pressure-gauges-large.pdf