FM-870 in 93 GMC Sierra, neutral safety

I am installing a Commando FM-870 in a 93 GMC Sierra 4-WD K-2500. I can’t seem to find the vehicle’s neutral safety switch or wiring. Could some please tell me what color wire to look for and where is the best spot to connect to it? http://www.commandocaralarms.com/itemdetails.asp?Productid=496 I am also wondering whether I should use a normally closed or normally open starter kill circuit? The FM-870 has an output for each mode. https://www.the12volt.com/relays/page2.asp https://www.the12volt.com/installbay/forum_posts.asp?tid=29696&KW=gmc+sierra+ Thanks For The Help Jason

Switch should be down toward the floor on Steering Column

Neutral Safety

ORANGE / BLACK (-)

AT SWITCH ON STEERING COLUMN **

** If Equipped With Electronic Automatic Transmission, Neutral Safety Switch May Be Mounted But Not Wired. Two Bare Terminals Will Be Present. Ground One Terminal And Take Neutral Safety Wire From Remote Start To Other. MO

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Thanks for the quick reply...

Normally closed starter kill will allow you to disconnect power to the alarm brain and still start your car.  Normally open starter kill will not start if there is no power supplied to the brain. i.e. better security, but if your brain becomes defective then you can not start your car without reconnecting the starter wires.  Hince, shops tend to wire starter kills normally closed, because if a customer has a problem wth the alarm and connot start the car, all the customer would need to do is disconnect the brain via fuse or harness.