Oh lord not THAT thing again.
It COULD work, but it won't.
First, there is a table in the ECM (if it is similar to the Grand Prix) called Air Temp Spark. This tablem modifies the commanded timing based on incoming air temperature. Now, here's the thing. Stock, this table will only take timing AWAY if the temperature is too hot. IT WILL NOT ADD TIMING no matter how "cold" it is. It does this (on the GP) to limit Knock. Hot air = greater chances for knock on a forced induction (turbo or super charged) application. To use this resistor you would need to go in and modify that table to add timing at whatever temperature range that resistor "fools" the ECM into seeing.
Now, unless you have the ability to do that it isn't going to work since all it will do is not pull timing under high heat conditions.
With the GPs...and this is something that I'm sure COULD be done on the Skys, we have what we call a Happy Knob. Basically it is the same thing as this resistor but it has different settings. We then go into our PCMs and modify the Air Temp Spark Table at those temp settings to add timing when the PCM "sees" that air temp. Now, we scan so that way we know when we've gone to far so for the Grand Prix, it works. You'd blow up your Sky if you did this without the ability to scan and see how it was affecting the car.
I'll have to look at the Sky's MAF/IAT sensors to see how they are layed out and see if something like this can be added to them. I'm sure Vector could change the Air Temp Spark Table to be able to use this feature.