Shywizard shared the image below on where to place your uv to work correctly for static (emissive) lighting. Also be sure to use vertex paint in blender for the color you want to be emitted when the light is activated. If you don’t paint in vertex mode you will get an error when applying the static variable in the vehicle shader. Materials and color can be edited like typical udim settings in the shader as well.
Below is an image explaining what the U,V stands for. Basically in blender U = X and V = Y.