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This is the brains.

Relay Board

This is the relay board. It is not necessary for an install, but makes this a whole lot easier and cleaner. Highly recommended.

Intake Air Temp Sensor (IAT)

This reads the temperature of the air coming into the engine so that the amount of fuel can be adjusted accordingly. For turbo applications, make sure to mount it after any intercoolers and after the compressor housing of the turbo.

 Coolant Temp Sensor (CLT)

This sensor reads the temperature of the engine. It uses a factory GM sensor base and is modified to read surface temp. It is not a replacement for a proper head temp sensor.

Throttle Position Sensor (TPS)

This reads the position of the throttle. 

Manifold Pressure Sensor (MAP)

This sensor reads manifold pressure. It requires a vacuum reference from a port after the throttle plates.