mercury switch is liquid i believe that sloshes to the other side or somethin like that, never toyed with one. If you don't want remote start don't get either of those alarms, get a 300 or something. The factory immobilizer is only bypassed during remote start and then is back to normal after the vehicle is started. They can hook everything up, and you can bypass the switch yourself, it's fairly simple. But if your just lookin for an alarm, 600 is way to much and your payin for the remote start on those. Get a different one, say the 300, or get a clifford.
-Brandon
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