Did you look at the diagram on this thread?The green is frame ground, and the darkened black wire the enable to the ignition controller from the side stand and/or the ground from the aux relay that is turned on by the neutral switch. So, the darkened black wire is grounded by the side stand switch being in the UP position, or the neutral light being on. The start relay is grounded by either the clutch switch or through the diode to the neutral switch, so you can crank with the transmission in neutral or the clutch lever pulled in. The Bl wire is battery power through the key switch.
These are a legally required safety system, so you can't start the bike in gear and have it leap forward. If you jut ground the darkened black wire, the ignition will always function, and your bike will have no mandated safeties (like my '70 CB450 Honda).
Reversing the sensor wires will affect the timing, by the time distance between the positive and negative pulses. If there is a way to confirm timing, like a window to the timing marks on the flywheel/rotor, assuming it has them, then you want to do that.As far as the sensor wires goes I do believe that it will work with the wires in either direction and can easily be changed polarity to see which direction produces the best spark without harming the circuit.
So far, so good, and yes, that pin is probably for an electronic tach or rev limiter.Looking at the CDI diagram the has the pin outs starting with the upper left pin which is labeled SGND pickup gnd.
1-That line connects to one of the two sensor lines
2-The second to the right pin(pickup/in) connects to the other sensor line.
Going to the connector on the right
3-That line is the fused 12 volt going through the power switch to the pin labeled voltage plus.
4- the pin on the right connector labeled OUT1 goes the the number one cylinder coil.
Going back to the left connector bottom pins
5-I am assuming that the bottom pin labeled (limiter/thacho) drives the tachometer?
Yes, that line is grounded by the side stand switch or the neutral switch to allow the engine to run, so putting the stand down while in gear will kill the engine. Quite common safety arrangement.6-DZC pin the the side stand that is connected to the Aux relay that makes a grounded circuit with the relay transfered
( Question grounding that line since I dont have a side stand switch yet should complete the circuit needed for the CDI?)
Going to the connector on the right bottom