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I have a 2008 Volvo 780. I am close to wiring my GPS and camera system. The computer (for the GPS system) and the DVR (for the camera system) are located in the area above the refrigerator, behind the driver. The computer is a full size desk top computer, with SDD, DVD player and a 12vdc power supply. The DVR is a security system recorder (with 16 camera inputs and two audio inputs) and is powered by 12vdc. I have built two custom shelves, in the compartment, above the refrigerator, to hold the two units. A 13 inch monitor is located on a custom built stand, located behind the dash (just to the right of the radio). The monitor can be swung over to the passenger, just in case the DW wants to assist in navigation chores. If we can get a cell signal, the DW will be able to surf the net and do her Facebook thing. The monitor is USB powered, with HDMI signal input and seems to do quite well in bright sunlight. There will be a control panel above the driver's head. The system will be using a wireless mouse and keyboard. The GPS puck was the one (actually, the next generation) recommended by Mark Bruse [spelling]. He and I spoke at the 2014 HDT Rally about his onboard computer system. The GPS puck works great. I was able to pick up satellite signals from inside my house and inside the Volvo. I need to run wiring conduit from the following areas: 1. From the computer/DVR shelf area to under the truck. The conduit will be used to bring 12vdc (from the batteries) to the computer, cameras and DVR. And, will be used for camera cable feeds. 2. From the computer/DVR shelf area to the compartment above the driver's head. The conduit will be used to run power, for each of the cameras (I will be able to turn each of the cameras on and off from the overhead control panel). I will mount a switch box in the overhead compartment that will allow me to switch the monitor from the computer to the DVR. The USB powered speakers will be located in this area. So, I will need to run the speaker wire through the conduit. 3. From the overhead compartment to the monitor. This will be used to bring power and signal to the 13" monitor. 4. From the computer/DVR shelf to the area above the work station table. This will be used to supply power and signal to a monitor mounted in a "flip down" stand. Passengers can go back to the work station and watch movies and/or surf the net. The upper bunk is alway in the down position. The latching mechanism is broken and is not worth the hassle to repair. Any ideas, pictures of conduit runs or, other suggestions would be greatly appreciated. Obviously, this will involve cutting holes into the HDT, which is always cause for concern. Thanks. Jim PS: For those of you wondering why in heck is this guy going through so much trouble just to install GPS and a camera system? The short answer is because it is fun The advantage to this system are as follows: GPS software easily upgradable. And/or several programs can be used. 16 camera inputs and two audio inputs. This allows for a video log of trips. Video log (with sound) of accidents for the insurance company (or plaintiff lawyers who would like to sue me). With 16 cameras, I can look anywhere around the truck and trailer. Easy to upgrade the monitor, as technology improves. Easy access to the internet, if I have cell service. Easy to upgrade the GPS puck as technology improves. Passenger can watch movies and/or surf the net at the work station. Easy to upgrade the computer, as technology improves. This computer was custom built, by a computer techie and is state of the art. Easy to upgrade the DVR as technology improves. As I get smarter ( ), I may look into having the computer replace the DVR.