Explanation: The Skyview D-1000's big DB connector on the back has 4 pins for a USB connection. In addition to that, the D-1000 has some standard USB female sockets on the back. The harness supplied by Van's (and built by SteinAir) uses those 4 pins connecting to 4 wires that terminate in a female USB connector which you mount facing downward in the base of the panel. If you do not get that harness from Vans, the harness you get or make may leave those 4 pins unused.
In that case you can get a standard male to female USB extension cable and run it however you like from one of the unused USB ports on the back of the D-1000. Or, you can buy a female USB socket that has 4 pigtail wires coming out the back, add pins to them, and slide them into the DB connector in the proper place (the Dynon installation manual shows those pinouts.)
Bill