Chur Kaney,
As requested here's some pics of the megasquirt. It doesn't really look like much.
The whole reason I brought it was to get rid of some of the unreliable and black box landy electronics such as the AFM and ECU.
Said AFM

The megasquirt uses air temperature and vacuum to do the same thing as the AFM. Both sensors are reasonably reliable and can be tested using a laptop.
Its currently in a half completed state. All tests so far have worked correctly.

Here is the test circuit which I also purchased from DIYAUTOTUNE. It plugs into the megasquirt to simulate sensor inputs etc. I have been using it to test functionality as I build it up using detailed steps on the megasquirt website.

By purchasing a "wide band" oxygen sensor, you can tune the MSII automatically. I think you set it up to make small changes at a time and if your happy you save the new settings, then do the process again. The oxy sensors I got also came with Air Fuel Ratio gauges which I can use to ensure both sides of the V8 are running sweetly (No stuffed injector). You only need one to tune the MSII but I liked the idea of easy fault finding in the future.


I have had a couple of hick ups, installed a diode in the wrong place and didn't install a resistor so got a weird voltage reading of 29V for a 9V battery

but managed to sort it.
I have been finding it quite straight forward so far...