if you have 2 wires going to your injector(any injector, pick one), you have a 50/50 chance of getting it right on the first try
If you can, I would measure the ohmage of an unplugged injector. If it is 7 ohms or less there is a good chance it could be peak and hold, which still needs fixing on the guino.
dunno vss, would have to look at a schematic, or use the one from a $10 bike computer