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GlowShift's 1/8-27 NPT Female to 5/8-18 UNF Male Adapter will allow you to thread any 1/8-27 NPT gauge sensor into a 5/8-18 UNF thread port. This brass sensor adapter is ideal for oil pressure and fuel pressure sensors that will not thread into your stock port. If you are using this brass sensor adapter for a temperature sensor, a test port sender extender must be purchased since most temperature sensors will not fit through the borehole. It is recommended to use Teflon tape on each thread to prevent any leaks for a secure connection.