Actually, the historically 100% accurate colours would be:
1) Reticle:
Daylight: Black
Nighttime: Green, due to radioactive mass in the wires placed on the lens
2) Bearing vernier:
Daylight: Black background with white numbering
Nighttime: Same but lighted with own lamp (white) and with a touch of the ambience light, i.e. if the conning tower is rigged for red, you would actually see the numbering in orange-red
Hope that helps