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dude if you're talkinga bout the line running RIGHT beside the maf then thats ambient air temp sensor. the wire for the power steering comes off the harness that runs over the driver side wheel well, it comes in through the hole in your chassis next to the master clutch cylinder, wraps around the strut tower and runs down to the hardline (where the pressure sensor is) and no it is NOT needed to run ps, it is only a pressure check. it will not make the system add or subtract pressure, its only to warn the driver of possible "low pressure".
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