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I have a 1LT and just let me tell you, it works... Who the heck told you it doesn't work. lol. As for the harness... You have to find it. I'm not sure which GM part number it is, surely someone can chime in.
I bought my Gauges with the whole 9 yards. It came with the harness, and everything you need to make the change.
Goodluck sir =D
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