You do not need to be using priming sugar with a keg. I may be wrong, but will you not end up with clogs in the dip tube or other parts of the beer line.
The extra wires on there are only as an extender, so you can put it in a loop between a HDD and the power supply so you don't take up an extra power cord from the Power supply. You should cut that off and have only the 2 thin wires. Look on ebay for a AC (to DC) power adapter that give you 12v...