company called Speartech can make you a custom integrated wiring harness....they've done them before for the LSx to Solstice swaps

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06 Cool solstice - Positively Displaced intercooled SUPERCHARGER Current Status : having fun
98 GP GTP - ~500hp (intercooled, 15psi) Current Status :broken Tranny
86 C10 Silverado ~ 450hp (383"^3 NA) Current Status : broken tranny