[AndrewJ]

Thanks for the tip dcb, unplugging all the injectors cleared the problem right up when identifying the right wire.

Even though I seem to have tapped the right wire now, I still can't get any fuel numbers to show up on the 'Guino. I even swapped the 'Guino from my car in there and it won't show any data...

So I know it's not the 'Guino, I know the "correct" wire is tapped (I continuity tested it going into the 'Guino just to make sure there's no problem with the wire)

Any other suggestions?

Any parameters I should be looking for that are required for the INJ input? (voltage, frequency, impedence)