Yeah I had a look at the megasquirt and it looks like a decent cheap option but I have 3 Link ECU's so I'm sweet for the moment

If you are looking at DIY check out the VEMS unit it's more expensive than the Megasquirt but it's a better design.VEMS SITE

This will go for about NZ$600 I'd guess
2nd Hand Link ECU
They sell brand new for NZ$970 New Link ECU

Here's the new Link ECU XLEM that I'm thinking of upgrading to.... when I find out what the extra $1100 is buying me.