What ohm range is the stock IAT sensor? I believe it's the same as the CTS sensor... if that's the case, can an electrical 'water temp gauge' be used as an air temp gauge?

Thinking about tapping after the intercooler, with a gauge on it, to see what my temps are getting up to, under boost.

 

To answer your question about the OHM range on the the IAT and th CTS, yes they are the same. As for the second part about tapping into the system after the intercooler I'm not sure about that at the moment/

 

Actually, I'm wondering if the ohm range is the same - and an electrical gauge for measuring water temp, uses a standard GM coolant sensor range, then could I use that water temp gauge, as an air temp gauge?

 

It is a thermal unit that reacts to heat regardless of whether it is coolant heat or air heat. The principle is the same.

 

The water and air temp sensors are interchangeable

 

Although the sensors themselves might be interchangeable, you may still want to use a MAT/IAT sensor for your application. If you're interested in seeing how quickly the temperature changes under different conditions, you'll want a sensor that can respond quickly to those changes.

There are a few threads (one relatively recent) that discuss the different IAT/MAT sensors. There's a model that isn't "encased" in metal. It just has a metal cage to protect the thermistor. That sensor is probably the fastest reacting of all that are available.

Of course, if you're only worried about steady state (i.e. 5 to 10 second average) readings, any sensor will probably work.