Hi, just been searching for a red text on black 40x2 display but can’t seem to find anything. I see some people have used these in their MB6582 builds and I’m wondering where to find them if anyone can help, thanks!
You could use a white OLED (or LCD…) and a red acrylic screen protector.
Great idea, thanks! Where would one find a red acrylic screen protector? 
For example at Schaeffer (Front Panel Express):
Quote
Perspex
Acrylic glass (Plexiglas®) is particularly suitable for display windows. We stock transparent acrylic glass in the material thicknesses 2, 3 and 4 mm and red acrylic glass (semi-transparent) in 3 mm.
You would need to design a stepped window but it can be done! Maybe there is a design file around. Another way is just to use a thin sheet of whatever colour, either with or without a clear window. But if your panel is thick, a nice window looks subjectively better.