Regarding the color-coding of aircraft instruments, which statement is correct?

The notion that manufacturers dictate the color-coding standards is correct since aircraft instrument color-coding is indeed often determined by the individual manufacturers rather than being strictly regulated by federal regulations. While there are general industry practices and conventions, manufacturers have the discretion to establish their own standards for color-coding of indicators. This allows them to create a unique and recognizable interface for their specific aircraft, taking into consideration the operational needs and feedback from pilots and operators.

In aviation, color-coding serves a crucial purpose in enhancing safety and usability by allowing pilots to quickly identify different ranges and conditions such as operational limits, caution zones, or normal operating areas. However, the specifics of these color codes can vary from one manufacturer to another, resulting in no uniform standard that applies universally across all aircraft instruments.