Well, I installed one of those indoor/outdoor thermometers that I picked up from Target this weekend. It was cheap - and it's a good thing. It's crap.

The indoor works only after the unit itself normalizes to the temperature in the cabin. If you get in the X and it's 32 degrees in and out, then hit the heater until it's 60 inside... Until the whole unit warms up, it'll read whatever it wants (cold plastic).

The outside sensor I place in the door jamb. Only problem is, I think it's too near the top, where there appears to be a vent/hole going through to the engine compartment. It's freezing outside, yet my outdoor sensor says 40-50 degrees! My guess is that engine compartment air is warmed, and somehow passes through that opening... I haven't really looked yet, so I'm not sure. I'm gonna try and re-locate the sensor.

If neither works out, TO THE TRASHBIN with it!