Sorry I didn't document mounting the GPS but others have. Search here on insideev.
The installation was pretty easy. From memory this is the rough method
- Position and fix the dashcam mount to the windshield.
- Run the power cord inside the black cover for the mirror wire. It's a tight fit but it works.
- There may be a step here to remove the cover in the ceiling where the garage opener buttons are. The car isn't here so I can't check.
- Push the cable along the leading edge of the headliner. It just stays there without any clamps.
- Pull the rubber off the door jam and run the wire down inside of it.
- Remove the left kick plate by the driver's feet.
- Find a screw or bolt for the ground wire.
- Attach a fuse adapter to the 12V GPS power wire
https://www.amazon.com/gp/product/B014K93ROM/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 The fuse adapter allows you to plug into an existing fuse socket, install the fuse that was already there, and add a second fuse for the camera.
- I've connected the power wire to the fuse box using the low-left corner fuse marked 7.5A which is an accessory fuse.
This way the wires are hidden.
I've installed dashcams in three cars so I may have this wrong. A variation is to remove the cover over the A pillar and run the wires there instead of under the door jamb rubber gasket.