I got the megasquirt from
www.DIYAUTOTUNE.com. They supply it in kit form or complete. I built mine. They provide great instructions on megamanual.com. The kit is made easily as long as the instructions are followed word for word. I also built my O2 sensor from
www.techedge.com.au. It works great!! Gives me a lot of feedback for tuning. I filled up today and got 8.15L/100Km. all the credit to
http://77e21.info/mstuning.htm, this guy has given me a way to tune the throttlebodies without compromise.