6.0 engine have low oil pressure replaced sending unit to no change.

If you replaced the oil pressure switch and still have low oil pressure. A few things could be wrong, a defective part, the dash oil pressure gauge is broken, The oil pick up tube is clogged, the oil pump is bad or the crankshaft journals are warn and you need a new engine. a normal engine runs about 10psi oil pressure per 1000 rpms

Have actual oil pressure tested with manual test gauge.. Professional scanner can run instrument cluster prove out (sweep test) to check gauge(s).. Got to do some testing!

Make sure it is a OEM Part, aftermarket sensor may be faulty. As stated, confirm with a Mechanical Gauge. Some have a screen that can be restricted!