Re: aftermarket wiring harness
American Autowire classic update is my preferred route. I don't know of a harness that includes the complete chassis, LS, and fuel pump/fans. Autowire Has extra circuits for modern upgrades like power seats, power locks, etc. or you can use them to power your LS harness and clean things up. Either rework your LS harness yourself or have Speartech do it. Run a separate fuse/relay block for fuel pump and fans.
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