Lost all oil and oil pressure while driving (Need help diagnosing)

did you accidentally double gasket the filter? ie slap the new filter on with the old filter seal still in place?

the sending unit has no effect on oil pressure-- it's only a "switch" that reads the pressure and transmits to your gauge. leaking 5 quarts from there would be quite a feat.

i'd suspect else where... either like at the filter like i suggested above or possibly you lost a galley plug out the back of the block.

what's the connection at the block for the filter? 90* or the flat plate?