The oil cooler intake or supply line is the same line that exits the top of the crank case and goes into the top of the oil tank. Splice this line with the cooler. The cool oil wil return from the bottom of my oil tank to the bottom of the crank case, near the sprocket. I put my cooler (Lockhart horizontal model) where the battery box was, after venting & scooping the side panel to increase air flow. E-mail me at jpoore1@yahoo.com if you want photos or more info.