R129 engine oil level sender

[temco2]

The lower right side of the engine shows an oil leak.So far it doesn't seem related to the valve cover. It might be due to old O-rings on the oil level sender. It is apparently a common problem with the 119 engines. Can anyone tell me if this sender is accessible without dropping the oil pan?
On the parts diagrams I have, it is clearly shown as a two piece assembly
with a little electrical lead connecting them and located in the vicinity of
the oil pump.The little plastic connector at one end of the electrical lead
has two O-rings that suggest that it penetrates the crankcase or upper oil pan somewhere. Thanks very much