What I did.
The acs keyswitch has the following pins on the back.
Here is how I wired it.
BAT - obviously to battery (powered off main bus with 7.5 fuse)
S-to starter contactor
BO-nothing
LR-nothing
GRD on outside- nothing
R-center of shielded wire to pin one from lightspeed plasma 2 box
GRD (center) -Shielding from lightspeed R wire, AND shielding from shielded P lead off left mag
L-center of shielded wire from left mag
NOTES-no jumper on keyswitch, shield both mag and EI wires to center pin.
As per Klaus at Lightspeed " p lead option with the plasma cdi allows you to connect the electronic ignition to a standard ignition switch as if it was an impulse coupled mag. The impulse coupled mag does not need to be disabled during start. Since you have one impulse coupled mag you should start on both. That means NO jumper on either side. Since we made some improvements in Dec 2004, there is no longer any reason to disable the Plasma cdi during start, even when the battery is weak. Never use a fuse to protect the ignition system, you need a breaker in the panel for the cdi. You need to wire your plasma CDI per our manual regardless of what hearsay is on the forums.
SO...your mission may vary, and Klaus would rather you contact him than listen to forum chatter.
Seems to work but I am NO electrical expert...but it starts when I turn the key!
PLEASE IF ANYONE SMARTER THAN ME CAN ADD, CORRECT, CLARIFY.....PLEASE DO SO. This is the best I got from all my research into this type of config.