Remote starter for a 2000 dodge help plea

Dose any one know how to install a remote starter in a 2000 dodge neon I used the wiring diagram from the sight and matched it to the book and it still wont start with the key off but if I turn the key to ignition and press start it starts right up if any one could help that would be great thanks so much

If the vehicle has a grey key then it has an immobilizer on it..and it needs to be bypassed. DEI has a couple of ways to do this you can buy the 555C which you don't need a spare key for..or the 555u, or 5556u(New 555u) which are cheaper but you have to have a spare ignition key.