viper makes one that is pretty good.... alarm with remote start.
i use it on my work van.... set the controls for full cool in the
summer, and start it 10 minutes before you leave.
viper, clifford... instead of finding an alarm, get a good installer,
and let him earn his $300 for spending half a day making it work.
nobody that i know makes a "plug in"... you are gonna have to
do some cutting.....
having my diesel van done was about $650..... but then i added
remote vehicle location, and a whole passel of other stuff, and
added a zero to that number.... but now it's got a two horsepower
stereo as well.... (1,600 watts) and a 12" alpine sub that can
knock loose stucco off the neighbors house, and drive termites
out of the framing as well.... it was a necessary work expense.
trust me.