Try to have it wired as T-Bag said, to the wait to start light. It worked great on our old demo vehicle.
I use the Clifford G5 series for the hardcore security systems but have had the best luck with Autopage. Clifford is limited in the amount of products that they offer but not in availability. The Matrix series is the same as viper and the G5 series still has the upper end security and technology features.
Check out the Autopage RS1000. Next month with an add on you will be able to
use your cell phone as your remote control to remote start, GPS track, alert of speed or location, check internal temp, check current status and tons more.
Forget everyone else claiming 1 mile range, I'm talking about world wide range. Call me at the shop if you have questions on this.