I am making a custom battery setup to run the tm and Lowrance. Starting at my single 12v battery I will run 6ft of 8 gauge cable/wire. The end of the 8 ga. will be a pos and neg junction block. I can then attach the tm & Lowrance cables to the junction block. The purpose for the setup is to be able to switch back and forth between side pulling arrangement and a standard transom arrangement. I see my wiring choices as this: 1) 2 lengths of separate wires. 2) Use jumper cables and remove the clamps and cut to size. 3) Home depot sells by the foot but 4 single strands that I would twist together. 8/4 600-Volt CU Black Flexible Portable Power SOOW Cord. Please give me your opinions.