White wire from MSD 6A box as killswitch?

http://www.msdignition.com/pdf/6series.pdf

Found on Page 6. Is this Just as good as using relays for ignition kill?

I'm trying to figure out how to wire it using a momentary switch. The theft detterent on the MSD box only cuts spark when the white wire is grounded. A switch has to be activated in order to start in my diagram. The thing is it has to use a toggle switch. The white wire must stay unground in order for the car to have spark. I'm guessing I'm supposed to use another relay to get it to work, but how would I wire it so.  Also, If I were to wire it to a a parking switch or any accessory as a switch, how would I wire it? The diagrams on the site are normally open configuration.

Also, what's the radio accessory wire on a 94 Honda Prelude. Is it the switch 12volts yel/red wire?

https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1994&make=Honda&model=Prelude&ID=18001&type=Stereo

Here's the diagram actually:

https://images3.fotki.com/v29/photos/2/22469/45074/untitled-vi.jpg