Hardware
The assembled controller takes input from several sensors in order to manage the fuel injectors, including a throttle position sensor (TPS), exhaust gas oxygen sensor (EGO or O2 sensor), MAP sensor, tach signal (or crank position sensor), intake air temperature sensor (IAT), and a coolant temperature sensor (CLT). The latter two sensors themselves are usually the General Motors type, although you can recalibrate the controller to use other sensors including Ford and Bosch.
As the project has gone through multiple hardware and firmware revisions, along with parallel projects that effectively "forked" the project and interlinked compatibilities, it is difficult to be specific about the capabilities of any particular MegaSquirt without knowing three things: microcontroller, printed circuit board and firmware versions.
Read more about this topic: MegaSquirt
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