> Could you tie into the buzzer that goes off when the driver door is open and key is in ignition?

That's exactly what I did :o)

toodle pip,
--
        Dug Smith         | Terry Pratchett: It's almost
(mailto:dug@dugbert.com) | impossible to ride a rock and roll
(http://www.dugbert.com) | motorbike and stay on for three verses.