Here’s the progress on my 1/12 scale 1957 Chevy model car interior. The first photo shows the bare metal foil panel and the LED lighted instrument cluster. Second photo shows added aging detail.
Didn’t take pics of the guage cluster construction, but is is made of different size lucite rods cut to 1/2 inches long glued to a roughly 1/2 inch By 1 1/2 inch by 1/16 inch lucite panel, which functions as a backlight. Micro LEDs are attached to the left and right edges of the lucite panel and then the entire backlight panel is wrapped in foil tape to reflect and prevent ambient bleed through light into the car interior. I then pressed that assembly into the hollowed out guage cavities.
The guage graphics are vector art printed on decal material. I couldn’t get the art to print opaque, so the entire guage face and cavity lights up instead of just the type. Not realistic, but still cool looking. I sealed the decals with clear gloss acrylic to get a glassy look.