who's driving on Highway oil pressure dropped lost engine power won't restart oil levels were fine no signs of leakage we're spilling anywhere no other recent mechanical problems replaced sending unit still won't turn over I've dropped oil pan and pulled pump is there anything else I should check before replacing pump any help is appreciated working maintain on vehicles but not a mechanic thank you

 

What year?

What engine size?

Can the starter motor turn the engine, can you manually turn the engine?
If not then you spun a main bearing and need to pull out the engine

 

yes starter will turn engine over
2002 ford ranger
2.31 4 cylinder

 

2002 Ford Rangers had 3 engine options, all are different
2.3l DOHC 4cyl
3.0l Vulcan V6
4.0l SOHC V6

Which one?

 

2.31 4 cylender

 

Never heard of oil pump problems with that engine, 2.3l Duratec(Mazda L) engine

It is a double overhead cam(DOHC) engine and use friction locked timing chain gears so they can slip
I would test compression, it runs 9.7:1 compression ratio so expected is 170psi +

Once that is done and compression is HIGH you can move on to spark or fuel issues, but ALWAYS start with compression since its a black or white issue, and if compression is low you will waste alot of time and maybe money on non-fixes