...
BTW the current drain by this computer board is so low it can be
powered
off the 300 volt outboard motor alternator mounted on the e-shaft
through a voltage divider. No battery required. As long as the prop
is turning you will have power for the ignition computer.

Paul Lamar

Paul -

All I can say in response to your "low power" board is ...   :)

The MSP430 series MCU uses so little power that it can be powered by
fruit!
http://www.youtube.com/watch?v=ZxGZIiyyxrM

The MSP430 MCU can run off of a "coin battery" for over a year.

The injectors and ignition are another matter altogether.

-Vince Orton