FAA-PMA
PMA PQ0333NE. Approved as a replacement for Boeing Part No. 10-60735-2 on The Boeing Company 737-9 (Pressure Indicator) · Current, Mar 2018. · in stock here Leading Edge Group, LLC, 8 available, quote
The OEM number it replaces, and who sells those here
A PMA part is approved for the specific eligibility listed on its FAA record; whether it may be installed on a particular aircraft, engine or component is the installer's determination. This page states the FAA record and the listings on PartsAndPlanes.