The Under Arduino 4 Channel boards made for Speeduino share the following features

Outputs

– 4 ignition channels, logic 5V, 330mA max pulse
– 4 injector channels, ground switching
– 4 high current outputs (idle, idle2, boost, vvt) ground switching
– 8 low current outputs (fuel pump, tachometer, fan, fan2, aux1-4) ground switching
– Accepts DRV8825 module for stepper idle control

Inputs

– 2 triggers (crank, cam, etc, logic level with socket for conditioner modules)
– MAP (250 or 400kPa) and separate barometer
– Voltage correction
– Throttle position
– Coolant and incoming air temperature
– Oxygen
– Flex fuel
– Launch
– Knock (future code update)
– 2 spare inputs

Communications

– Serial3 routed to external connector (optional CAN with future module)
– Bluetooth header with blocking diode to allow use of USB

Version vB3 Sea Fox changes include:

-All boards now ship with 400kPa MAP sensors for no limit boosting 

-Minor component/placement adjustments

-Further improved labeling

-Assembled in the USA

Version vB2 Sea Fox changes include:

-All SMD components including the sensors are now soldered on from the factory
-5 volt output is protected from overload
-Corrected parallel install issue
-Harness connector footprint improved to better hold the connector while soldering
-Further improved labeling
-Assembled in the USA

A new version of the UA4C (vB1 Sea Fox) is available
Changes include:

– Rearranging the serial headers for better fitment in the slim case
– Upgrading the low current outputs, they now support larger loads and are self-protecting
– Changed tachometer circuit to allow 5V, 12V, and high voltage tachometers
– Added indicator LED for 5V power, and improved labeling