Follow up pictures as requested!
Hey all! Had a few extra minutes at work and snapped some photos....sorry about the quality...they were taken with my phone :-(
Here's the completed install with all 4 sensors in:
Here's a few pics of how i ran the wires in between the bumper and crumple zone:
After I ran the wires i tried looking for a a place to run the sensor wires from under the car to inside the cabin....finally i found a round cut out in the subframe of the car that went dirrectly behind the driver side taillight....I drilled a hole and ran the wires through + sealed with silicone.
The first picture is that small hole i just mentioned...it's located under the car between the rear driver side tire and the rear bumper. If you're underneath the car you can't miss it

just look up.
The second photo is where I drilled the hole to run the wires through....I have to admit...i was too lazy to take the pannel off again today...but I drew a red circle on the picture below where I drilled the hole...U have to use a 1/2" unibit and go all the way in. You might run into the subfram underneath while drilling but don't worry...it's some real tuff metal and it will just push the unibit over as you drill.
I mounted the box further behind this pannel and hid the display in the dash because I thought it was ugly lookin....but it has a loud ass microphone so...ya that's enough for me.....beep beep beep...ahhhh that sweet sound! 8)