The turbo charger needs a return line to feed oil back to the sump. I brought a few bits and pieces planning to drill a hole in the sump and fit a tank connector.

Here we have: 15mm flanged tank connector 1/2'' BSP female elbow 1/2'' BSP to 16mm hose barb

To fit the tank connector I would have to remove the sump. This turned out not to be possible without removing the front cross member. To remove this I would have to remove most of the front suspension, steering rack etc, a big job to do on my back in the street.

I spotted the oil level switch. This came to my rescue.

Above: oil level switch (some bolts removed at this point	Above: Oil level switch removed

As luck would have it, the round part of the oil level switch was almost exactly the same size as the flange on the tank connector. I made an aluminium plate to pick up the bolt holes                    

Some builder's silicone and the gasket from the oil level switch got the oil drain to seal properly. Note that the seal is on the face of the tank connector. Due to the construction of the sump this will not seal if you make a traditional style gasket fitting over the aluminium plate part. Took me 4 attempts to work this out...