OK, here are some pictures of my install. My car has the factory Nav so I started by tapping into the screen video and putting in a switch box I bought from RPM.
First, I pulled the glove box and the Nav DVD drive.
I opened up the Nav harness and soldered in the connectors for the switch box.
While I was in there, I attached a wire to the VSS signal going into the Nav box.
I then neatened up the harness. I also took the opportunity to stick my AUX switch box back to the firewall with hot-melt glue. I had previously mounted it with double stick, but it came off the insulating fuzzy stuff.
Then, I pulled apart the entire stack and center console top.
Next operation is to install a control switch. I got a little rocker switch at the local surplus shop. It is a three position center off single pole switch. I decided to mount it on the bottom of the climate control panel. I opened the control module and put the switch inside, and soldered three wires to it.
Next, I mounted the video switch box deep inside the console with hot-melt glue.
The next task was to mount the computer unit under the trunk area. I pulled the spare tire cover then removed two screws and took out the plastic piece at the front of the trunk area. I cut out a notch in the rear of the plastic on the left side.
I stuck in a chunk of wood, it turned out I had a piece of 2X4 and 1-1/2" was about the right thickness, plus some foam tape. I stuck it on with hot-melt glue.
I then attached the computer to the plastic piece with an aluminum strap and a couple of sheet metal screws into the plastic.
Here it is for a trial fit.
I then tapped a shielded two-connector cable into the CAN bus in the passenger foot well (sorry no picture). I ran an RG8 coax with an RCA connector from the video switch box into the passenger foot well. I also tapped into the PJB harness to the power wire that would go to the sun roof if it had one. I tied the three cables together with zip-ties, coax, power wire and CAN bus cable, and ran them under the carpet along the passenger side sill. I had to take the rear seat bottom out for access, along with the front and rear sill plates, and door pillar trim. I routed the cables to the computer unit and put on connectors. I fired it up and it worked the first time! I then had to reassemble the entire interior.
Here's some pictures of gauge styles.
Here's the wireless presenter I use as a mouse to control the screen. It is mostly unnecessary, just for setup. Of course when it is new, I use it all the time to play with stuff.
Here's a picture of the control switch installed, taken from way down low. It is nearly invisible from a normal seated position or above. With the switch in the center position, the Nav operates and displays normally. In the right position, it shorts the VSS signal going to the Nav unit to ground which removes the nanny and allows entering addresses and stuff while the car is moving. You don't want to leave it in that position because then the dead-reckoning doesn't work when the GPS signal is lost. In the left position, it tells the video switch unit to connect the Magden video to the Nav display.
Here's a picture of the finished computer installation. In the foreground you can see the USB wireless adapter for the presenter. It is just stuck to the floor with some 3-M double-stick.