Hi all I'm new tuning and looking forward to learning. I have done a few ls swaps into obs Chevy's and trying to save some time and money having to send the ecm out for programing. Current project is 1988 single cab short bed 4x4 with a 2005 Tahoe 5.3 and 5 speed manual. Looking for advice with AC. Using the obs system and it doesn't have a pressure switch to start the fans. Anyway around it?
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