MegaSquirt 1 Programmable EFI Engine Management System PCB3.0 Assembled Unit by DIYAutoTune Onboard MAP sensor for NA or boosted engines up to 21psi MegaSquirt 1 Compatible with output from narrowband sensors and wideband O2 systems Controls 2 fuel injector channels, fuel pump, and on/off idle speed control valve Free tuning software allows for real time tuning and data logging for later analysis Speed density or Alpha-N