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Once the trim ring is halved, spread it open and remove from the gauge. Careful - this is the only thing holding the lens and lens ring in place. You don't want to drop the lens.
Optional step: use a small amount of clear silicone to glue the lens and ring in place on the gauge. It is not a necessity, but will make installation easier later on. Reminder - make sure the gauge face and inside glass are very clean before you start gluing.