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Hardware feature List:
Supports up to 8 cylinders fuel and ignition using 4 channels of fuel and 4 channels of ignition outputs, 2 (Even fire only), 3 and 4 cylinder engines with full sequential fuel and ignition. 6 (even fire only) and 8 cylinder engines are supported with wasted spark and 2 squirts per cycle.
4 Injector output channels.
4 Ignition output channels with selectable logic levels (12V/5V).
4 Pre-configured analog input channels for CLT, IAT, TPS, and O2 sensors.
2 Trigger inputs for crankshaft and camshaft position sensors.
1 Dual VR conditioner mount (conditioner not included).
1 MAP sensor mount location.
1 DRV8825 stepper module mount for controlling stepper idle control valves.
4 medium-current spare outputs (e.g., fuel pump, thermo fan, boost control, VVT, etc)
5 unpopulated/configured optional low-current spare outputs in "proto" section, including tachometer-out
1 Flex fuel sensor input in "proto" section,
1 Clutch switch input (ground switching).
1 Serial header (Serial0) often used with HC-05/HC-06 Bluetooth module (see Speeduino Wiki for setup instructions).