I read the manual, but didn't see the words you refer to, just a Mopar diagram. Anyway, I used a standard auto relay when I rewired my 65 Dart (see post, "Modernized Wiring ..."). The relay's coil are terminals 85 & 86. One terminal (coil+) connects to the "start" wire (from key, usually yellow). The other terminal (coil-) you wire to the NSS. Normally, it would go straight to ground. The NSS breaks that path to gnd until it is happy (in P or N), thus disabling the relay. If your NSS had 3 terminals (~1967+), you use only the center terminal. The outer 2 terminals are for the backup lamps. Look at your relay (and its base) to see if there is a diode symbol. If so, you must use the correct terminal (85 or 86) for coil+. I recall that 85 is normally coil-, but have seen exceptions. BTW, later cars like my 1996 Voyager (and recall my 2002 T&C) use a standard auto relay for the start circuit, exactly the same way (no computers).
