i installed a remote start and alarm on my dodge. The remote start feature taps into one of the wires from your pcm for your grid heater. Once your grid heater cycles and your wait-to-start light goes out, the remote start activates and starts your truck. I love the remote start. It is definitely worth it in my opinion. You just have to be patient when installing it. It took me 9 hours to install my alarm/start.