No need to drain the oil. With the engine warm, loosen the center bolt on the filter cover and crack same. This will allow the oil in the canister to drain back into the block. Once the canister is empty, you can remove the sender with only a few drops coming out.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.