The oil supply is taken from the oil pressure sender port located under the power steering pump on the left front side of the block. Use a hydraulic grade single braid 3/8" ID hose for the oil supply to the Model 25 Spinner. The existing sender is removed and a tee installed with the sender being re-installed into the tee. The oil supply line in this example is run along side the driver's side of the block and up where you can see an inline tee with a ball valve is installed for oil sampling duties.

The oil return for this installation is incorporated in the mount for the Spinner. The oil filler tube has been replaced with a local muffler shop mandrel bent piece of pipe with a piece of 1/4" plate welded onto the top, drilled with 4 mounting holes and a 1" center hole to form the flange for the Spinner to mount.
The generic Model 25 installation guide indicates a 22mm , (7/8") inside diameter is the minimum fitting size on the engine's block needed to insure the oil exiting the Spinner doesn't back up the return oil hose into the centrifuge, contacting the turbine and dragging the rotating rpm down severly with resultant loss of centrifugal force and oil cleaning ability. This event is termed "flooding" and a successful installation will never do this. Using the oil filter tube is a great installation idea provided you don't mind unscrewing the Model 25's cover to add engine oil. With a bit more work a fill tube can be made from a 'Y' pipe, one side for the Spinner, the other for the filler.

These instructions are guidelines, use your own good judgement in your particular installation.