Abstract: The cylindrical enclosure for the gauge mechanism includes a front portion with a transparent surface and a rearwardly extending side wall which terminates at an outwardly extending flange. One or more gaskets of appropriate aggregate thickness are selected and situated on the flange. The front portion fits snuggly into the panel opening with the gaskets adjacent the rear surface of the panel. The gaskets are selected such that the thickness of the panel plus the aggregate thickness of the gaskets equals the depth of the side wall. This results in the front surface of the gauge being coplanar with the front surface of the panel. In this manner, a single size gauge enclosure can be adapted to be flush mounted to panels having a range of different thicknesses.