There's someone ins Sydney whose worked out how to adapt megasquirt to the factory sensors on a 3sge (turbo?) on this forum somewhere - searching for megasquirt should drag out the guilty party.
Oldcorrolas is also a confirmed user and i'm just the overly keen evangelist...
OEM dizzi with 24 tooth wheel and a single second pickup and wheel with 2 teeth, or two pick-ups with a single tooth < http://megasquirt.sourceforge.net/extra/wheel2.htm l> - known as "2nd Trigger" Wheel decoder configuration for MS-n-S.