How to fix oil pump on a 2006 chevy truck 2500

The engine oil filter may be blocked and causing high pressure as the pump is trying to force the oil through.

need new oil pressure sensor

First check the sender unit and the gauge

60psi cold / 30-45psi warm is ideal. I've seen (with that mileage) 45 cold/ 20 warm and that's acceptable - anything less start thinking about a new oil pump.

Does it idle good no missing or anything like that can you hear any vacuum noises can't be fule pump if fule pressure good might pay to have a look at the throttle body for any carbon build up

Oil pressure is created by the oil pump, the main bearings and cam bearings. If these bearing are worn, excessive clearance, you will lose oil pressure. The rattling could be a rod bearing or wrist pin. You could try installing a "wet gauge" and check the oil pressure against the OEM specs, at different RPMS.

Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,

your oil sensor comes on at less than ten psi, you may have internal engine damage how many miles on engine, any gum up inside engine, you can try to put on a high pressure high volume melling oil pump to try to help for the time being, but you may need to have it torn and repaired.

oil pump might be going bad