MegaSquirt-I EMS’s are setup by default as a fuel only EFI controller running though they are running the current stable release of the MS1/Extra firmware. These are configured to be triggered from the (-) negative terminal of the coil by default. It is fairly easy to convert them to be triggered from a Hall/Optical/Points trigger if you prefer. Here are the steps to take:
- Cut out C12 and C30. Don’t jumper them or anything, just clip the leads and leave them out. (Assembly steps 50h and 50d)
- Jumper D1. You can remove the diode first, but you don’t have to. It’s easier to just solder a little lead shorting both of it’s legs together.
MegaSquirt-II EMS’s are by default configured for fuel and ignition control running the current stable release of the MS2/Extra firmware. These are configured to be triggered from a Hall/Optical/Points trigger by default.
MegaSquirt-III EMS’s are by default configured for fuel and ignition control running the current stable release of the MS3 firmware. These are configured to be triggered from a Hall/Optical/Points crank trigger by default, and with the MS3X board added also support a similar Cam sensor input allowing sequential fuel injection.