Thanks for the question.
Do you have the 2.2 or 4.3 engine?
The oil pressure sender is located below the distributer, on the back of the engine...
Is it necessary to remove the distributor? If so, how do I go about doing that?
Yes, the distributer needs to come out.
Removing the distributer can cause some ignition issues if it is not re-installed correctly. Do you wish to continue?