Using the microsquirt controller. Plan to use it for both spark and fuel. apparently version 3 was recently released. It's almost functionally equivalent to the megasquirt II. With a cam sync signal and a crank position sensor. I can have the controller use single fire spark instead of dual fire ignition in theory giving the coils more time to charge and have a better spark. I doubt it will make any difference though. The two sensors also give me the ability to do sequential FI. I plan on fabbing up an aluminum intake manifold with a single 38mm throttle body. Right now I am trying to figure out the crank position sensor. Gonna try to use one of the factory VR sensors on a 36-2 trigger wheel sandwiched between the flywheel and starter clutch.
The microsquirt II has been out for a long time. I was putting off buying the controller until ver. 3 which is now available.
If you just want to do FI you can trigger off the negative coil wire, much like how you would hook up a tach.