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.
This gauge is used to check the vacuum behind the throttle of a car. The vacuum degree behind the throttle valve can reflect the relationship between the engine speed and the engine load, and the driver can judge the engine working condition according to the signal of this table. Of course, this watch is used in car maintenance to detect whether the engine is running normally and whether the intake and exhaust are smooth. Whether there is air leakage behind the engine throttle valve when idling, etc.
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