Re: Need help with a wiring harness.
According to the diagram you posted, it looks like you're looking for an engine harness for a 6-cyl truck with factory gauges. That harness should be readily available from the sources already mentioned.
And yes, the numbers on the wiring diagram indicate the wire gauge and the letters indicate the insulation color. I don't think I've ever seen a color key chart, but most of these were pretty straight forward ... B=black, V=violet, DG=dark green, etc. The only one that isn't quite so obvious is the W/OR/V which indicates white/orange/violet and is a special resistance wire with a multi-colored cloth type insulation.
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