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2.Once the 7/16-inch hole was drilled and the metal shavings removed with a magnet, a 1/4-inch NPT tap was used to make the proper threads. The tap was coated in grease to catch most of the shavings, but the magnet was used again just in case. One thing we don't want is metal shavings running down the pipe and entering the turbo. When the tech was sure the shavings were evacuated, he installed the thermocouple.