This particular gauge has a screw on bezel which makes disassembly fairly easy. Some gauges have pressed on bezels and must be carefully «coaxed» off. Once you have removed the bezel, carefully pull off the needle by firmly gripping the center with a good pair of precision needle nose pliers. (Mmmm, is this why they are called needle nose pliers?)
Depending on how the dial face is attached, remove the dial and measure the diameter. If you cannot remove the dial face, it can remain in place at this point. Generally, the original dial is reused to help support the new face dial so don’t worry if you can’t remove it.
Now is the time to clean and polish the housing and glass.

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