1969 Dodge Dart Gauge Bezel Lens Replacement

Yes they are "staked" with an hot Iron. Think of it as a melted plastic rivet. Soldering Iron would work to stake it on the new one. To remove the old one you'd need to drill and/or cut the old melted stakes off and hope they didn't bond with the lens material

The spare dash I have has a few broken stakes so they don't seem to bond, just mechanically retain.