There are two modes for the brightness and colour setting: Daytime mode and Nighttime mode. You can set the different colours and brightness in different two modes, then you can turn on/off the headlight to switch between Daytime and Nighttime modes after you connect the Yellow wire( in the power cable) to the headlight fuse.
The purpose of installing the turbo gauge is to observe whether the maximum boost value reaches the set value to confirm whether the turbo is working normally and to check if the surrounding pipeline is leaking. Another function of the turbo gauge is to monitor turbo overpressure.
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