Yeah, I have the instructions. If you have seen the setup both wires from each solenoid are black with no writing that indicates if one is specifically positive or negative. I wanted to confirm if it doesn't matter which way you run it. Choose one from each and wire to #4, and #5 as grounds then use the other two to #6 as the positives.
some of the new ones are polarity sensitive, but most of the ones Ive seen have red & black leads coming out of them.
we are now buying some that have diodes build into them so that it reduces the flyback voltage off of the coil (instrumentation use). for the most part if both wires are black (or red or any other color), they dont care.
In short, when you energise a coil, it builds up a big magnetic field (duhhhhhh, thats how it works), but when you turn the power off, that magnetic field, will actually put voltage back into the wire (sometimes a LOT of voltage). the diode gives the voltage a way to discharge. if its not there, the voltage goes back to where it came (the nitrous controller or Boost controller). some of these devices will get damaged if the designer did not think about this ahead of time.
Most of the valve drivers now days have diodes build into them to take care of this, but sometimes they are not big enough to take care of big noids. the ones that we have @ work were not big enough so we ended up putting diodes right @ the noids on the connector.