You guys are all 1 year behind the times!
I put one of these Radioshack clocks in my '05 WRX last May! see the link here:
http://forums.nasioc.com/forums/showthread.php?t=577061
I wired it into the cigarette lighter wiring in the center console, ran the probe thru the firewall and in front of the radiator. It has worked well on the original batteries since last May. I've buffed off the Radioshack logo as well. Only recently have I noticed that the LCD display is a bit dimmer on the coldest mornings so I suspect that it will need new batteries soon. I like the alarm function on that blinks the red LED below 35 degrees or so, but the audible alarm needs to be eliminated! That 's the next mod....When I change the batteries I will clip the sound maker's wires.