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They are simply a push fit. The four lugs should grip tight enough in the hole to retain it OK, so trial fitting when you make (or trim) the hole is important.
I normally make pie-wedges in the leather for the trim, then fold the triangles back through the hole and glue to the back of the aluminium. That way you are much less likely to get it coming unglued around the instrument bezel.
And don't forget to position the external bulb holder for the fuel gauge, which is mounted on the clamp, so the bulb can shine up into the ammeter as well. The ammeter has no illumination source of its own.
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