In the past, setting up car dashboards was a major pain in the you know what. With build 1133(Q2 2023), it has been made much easier. You no longer need separate meshes for every single item you want, now you just specify the offset and size in the cockpitinfo.ini file.
Formula E Gen3 Display
With the new system, you can remove all separate meshes you've made, and replace them with one single mesh. You may possibly need to use more than one if you cannot get positioning correct, like in the above image, the temperature wouldn't display correctly, so I needed a mesh for it. The other bar above could also be part of the main mesh, but it was done later, so everything else would need to be re-done, so I would suggest planning out exactly what you want to do before you do it. The way the mesh is setup is the exact same as before, it can be it's own instance, or attached to the steering wheel or whatever you need it to be.
Material for a dashboard display, nothing has changed with them.
Luckily, nothing has changed with the materials, so you can re-use one of your old ones, if you have one.