The Subaru Oil Galley plug is ideal for those customers desiring to install an Oil monitoring gauge. It has a predrilled hole in the middle that will fit most sending units. 1/8th NPT will screw directly into it. The plug itself screws directly into the top of the Subaru short motor, just below the throttle body on the right side (to the passenger side). The units we sell are silver, not gold. Subaru started making the gold ones silver. Don't forget to purchase the associated Oil Galley Gasket to go with it (sold separately). You may add it below, or by going to this link.