the inputs and outputs of the board are as follows as circled in
yellow: Speaker output (3w)
blue: amplifier (left-right-gnd )
red: external switch input (the switch that can be placed under the gas pedal)
if the decimal comma led pointed by the yellow arrow is ON the displayed file is randomly played as the turbine sound.
if the decimal comma led pointed by the pink arrow is ON the displayed file is randomly played as the blow off valve sound.
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