It's a big check-engine light! Use "LED neon" strips from ebay or aliexpress, about 6mm wide and 12mm high, 3m length. I did not add holes or cableways, that'll be V2. It's easy enough to drill or poke holes where needed.

This is a big print, about 16 inches square. No, I will not cut it up for smaller printers, there are tutorials if you want to take this on.

Printed on a Rat Rig 500 in about 10 hours. 20% rectalinear infill, 3 perimeters, 630g of filament, mouse-ear brim. Changes I would make: 2 perimeters and 10% infill.