instrument cluster repair what glue to use

I use Devcon products and they are the best I have ever found for gluing plastics, not all plastic welder glues are the same, I've tried some from autozone and ace hardware and they didn't hold up Devcon did.
This stuff needs a gun and mixing nozzles, it's well worth the extra $

McMaster-Carr
But if you use ABS cement on ABS, PVC cement on PVC, Polystyrene cement on Polystyrene, etc... you get a bond very similar to a weld. All those 2-part adhesives and epoxies are good, but nothing will ever beat the correct cement that is matched to the material.