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First, when you buy the stereo, pick up an adapter harness for a Toyota (It plugs into the original wiring harness and has the color coded wires you will \ can butt splice into the harness that comes with the new stereo).
Remove original stereo and keep the mounting brackets (on the left and right). When you put the Single Din Stereo on top of the Gauge Pack, the brackets will match perfectly. Use the same screws to mount the brackets to the stereo and Gauge Pack together.
The color codes on the new wire harness adapter and the harness that comes with the stereo match (Green goes to green, purple goes to purple and so on.) If you want to double check, check the instructions on the harness and the stereo.
Four wires for the Gauge Pack. Constant 12V, ACC 12V, Ground, and Illumination. EDIT: Found the pic!
I can't find the paper I had those wrote on right now. There are several threads on here and Yotatech that has them. I tied these in with the butt splices on the wiring harness.
As for the sensor, I just mounted it to the metal "tab" on the front bumper that has the Vin Number sticker on it.
This thread has instructions on how to use the settings.
Subaru Gauge Pack (FMU) in 4Runner? - Page 2 - YotaTech Forums
Only problem I have is when I turn my lights on, the gauge pack lights flash. If my lights are off, the illumination is perfect. So this weekend, I'll check my wiring and see why it's doing what it's doing.