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 oil pressure gauge is to grasp the oil pressure. The oil pressure refers to the pressure sprayed from the oil pump. This pressure is responsible for entering the gap between the crankshaft and the connecting rod so that the metal parts will not rub against each other. , if there is no oil pressure, the metal will rub against each other, causing serious damage to the engine.
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