*Finally* got access to the wiring diagrams for my car. A section of the wiring diagram showing the link between the main computer and the injection computer is shown
here. The A10 unit is the injection computer as shown by the tooltip. The large blue rectangle at the top is the main computer. There are only 2 wires between the two computers, black/green and blue/red. How can I figure out whether I can use one of those wires for the MPGuino?
The other wires connected to the injection computer are live, ground, spill valve and timing control valve (Y33, visible far right).