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Require a complete design for an Arduino shield.
Start with standard Adafruit shield : [obscured] /rgb-lcd-shield
However we need to add a couple things:
1) We need to operate automotive 12V relays so need to amplify a number of the outputs. Possibly use a ULN2003 chip.
2) We need a wire connector/plug similar to a automotive radio. Half of the connector would be attached to the PCB the other will contain wire leads that can be connected to the vehicle power, inputs and outputs. Selection of this plug connector is part of the project.
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