I unfortunately can't answer all the questions, but i'll try to help the best I can ... I have had to start my 94 e320 with the x27 trick (if that is the connector close to the brake booster) the key has to be turned in the ignition first (either acc position or on position, can't remember) and then put 12 v to the center of the x27 connector ... i have also had the nss go out without warning .... i had to bypass the nss with a connector above the gas pedal until my new nss arrived ... if you need the bypass instructions I'll try to find that post, but I know i saw it on this site

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1994 E320, 145,000 miles