2007 350z neutral safety?

If you use a general purpose transistor (like a 2n2904) you would wire the base to the P/NP wire (brown wire in car) the emitter to ground and the collector to the alarm.

You should incorporate a few resistors to protect the transistor - a 470 ohm resistor between the P/NP signal wire and the base should work, and then a 100 ohm resistor between the collector and the alarm.

This will convert the polarity without making any noise.

Have we found out what he is installing yet? This is why I ask:

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