Greddy oil sandwich adaptor for the 02+ WRX or 04+ STi. Goes between the engine block and the oil filter. Provides for two 1/8 BSPT taps for oil pressure and oil temperature sending units. Omori oil pressure/temp gauges come with 1/8 BSPT fittings. A perfect match without any need for adaptors. This item is only really needed if you have both the oil press AND oil temperature gauge. If you have only one gauge, oil press or oil temp, the Subaru oil galley plug should be ordered.