The thermometer shown in the JC Whitney link, bottom of page for $16.99 is on sale at Benny's for $11.99. I got one for my '07 Access Cab a couple of weeks ago. Works great. The sensor is "wired". I stuck the display unit (comes w/adhesive backed velcro) on the dash under the heater controls and snaked the wire back under the console, under the rear mat on the driver side and out behind the driver side rear Access door. The door closes over the wire. I stuck the sensor on the box, in the gap between the cab and the box where it's out of the sun. Works great and is very acurate. Reads in tenths. My wifes "05 Camry "factory" thermometer only reads in whole degrees.
The unit has a LCD digital clock, Inside temp AND Outside temp. NO COMPASS. TacoGuy