Dear Lord!!!!!!
He said he HAD a remote start system in the vehicle already!!!!!! So there is ALREADY a brain in the vehicle that manages the power, starting, engine running, all that!
There is no worry of the thing starting when you don't want it to, starter engaging when it is already running, etc., etc., etc.

All he needed was a question answered about a relay contact from URC, to trigger the remote RF transmitter - that is 'already' part of his remote start vehicle system. That was answered in post #2.