The MegaSquirt is a programmable electronic fuel injection controllers are standalone EFI controllers that offer very flexible tuning options using a laptop computer. These controller range from build-it-yourself controllers to completely assembled, ready to install controllers. Some MegaSquirt vendors even offer ready to install wiring kits complete with finished wiring harnesses and tuning for certain vehicles.
The assembled controller takes input from a few different sensors in order to manage the fuel injectors, including a throttle position sensor (TPS), exhaust gas oxygen sensor (EGO or O2 sensor), MAP 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.
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