Megatune is the software that as I can best describe it "Manages" the settings within the ECU, Whilst we wait for a grown up to come along and explain (which would be very useful for me and save a lot of time ) I will at the very least explain the basic software you are going to need to configure your MegaSquirt, and get it running, see whats going on inside your engine and then hopefully be able to tune it up so it runs as best as you can make it. I was gonna write a bit about tuning but a) I'm lazy and b) Since Ian reads this thread I'm sure he can offer far better advice than anything I'd come up with. You can use almost any normal (rectifier) diode capable of handling 1A or more (I F=1A), the part number Nige gave is more than up to it.
But, when you turn the key off, the electric can't flow from the alternator back through the light - and so the car stops! The diode acts like a one-way valve for electric, so when the engine is off and you turn the key on, it can flow from the battery, through the light to the alternator as it should. Now, this relay only needs a tiny current (0.01amps) to keep it on, so the small trickle of electric that comes back through the alternator warning light when you switch the key off is more than enough to keep the little relay switched on and the engine running. When we put MS on the whole thing is fed from the battery live and switched on via a relay connected to the ignition live. When you have a "normal" setup, the vehicle stops on the key because it requires a decent amount of electric to power the coil.
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