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Ive done it different ways. But not on my 6th gen.
An OBS chevy truck i did an extension for the pcm. Just equal length wires one at a time.
My trans am i built the engine bay harness from scratch, so for that i uses zipties in places i wanted the harness to run . I left the zipties loose like big hoops and ran wires once at a time for each component. Once i was sure i was done i tightened all the zipties and pulled the harness to tape it.
For my blazer i removed the factory fusebox and wired in 2 seperate boxes higher in the dash. I made most of the changes just from the firewall to the boxes. It was a lot of wire extension but i also wired all of the power feeds from the battery to the boxes in a bus form instead of individual power wires like it came with.
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