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amen to that. battery+ to pusbutton and out the other way to starter selonoid 'S' if you have a manual. for an auto you should wire in the NSF as well. If you run the additional wiring like 2+2 says you can always fall back to the key
If anyone does set up a secondary starter/ignition switch, it should absolutely pass through the NSS if AT.
Bybassing the NSS means that one day the car WILL be accidentally started in gear and very, very easily kill someone. It only takes one time. No joke. The danger here isn't to be taken lightly.