[Phantom]

You should be able to use any automotive temp sensor is you can get the print out of the voltage to temp reference, I believe most of the GM ones are linear and that the IAT are the same just with a different housing.

You have at least a coolant temp sensor so create a pigtail to split the connection one going to the OBDi PCM and one for your controller. All they are is a resistor that changes values with temp.

To check the position of the louver pick up a Throttle Position Sensor from the junkyard the ones from GM use a 5v reference with .3v being closed and 4.8v 100% open and it is also linear. Other manufactures sensors might run the same way but I'm not sure.