Special tool for Oil Pressure Sender?

Is there a special tool that fits the stock Oil Pressure Sender on a B6100 ? The outer ring on the sender isn't six sided like a big bolt but looks closer to maybe an overgrown torx socket. Also the wire connected to the sender seems to be one piece from the harness. I don't see where it is supposed to disconnect to remove from sender.

In one of the online parts catalogs I see a replacement sender's outer ring is six sided and has a standard push connector on it.

What's normal?

-Keith

I took off the muffler and the side engine cover to get a better angle. The electical connector on the sender was a phillips screw. The sender itself had 12 sides and exactly fit a 1" deep socket.

The old sender was 12 sided so only the 12 sided socket would fit it. In the parts catalog the new senders look to be six sides but a 12 sided socket should also fit a 6 sided sender. The 12 sided socket I used was 1" but I guess the sender is really maybe 26mm in metric.

-Keith