Cheers Baz that's very helpful. I have been planning to use an Emerald ECU for mine but I have a background idea to use Megasquirt instead. As you have said it seems quite complicated to work out exactly what bits you need. I did find another interesting website the other day
http://www.diyefi.org/ but this seems to be about building an ECU system from scratch
. I think I'm leaning towards the Emerald still but the cost does make me wince a little.
D.