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Re: LS Standalone DIY harness
That's a Gen3 engine from an early '07, so just use the diagrams on Lt1swap.com for a 2003-2007, they're the same. As for the A/C, probably not going to be able to run it through the PCM since starting in '03 they went to a serial data controlled A/C request rather than the older 12v request. There are ways around it to an extent, but usually easier to just run the A/C separately.
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