2003 Dodge Truck Click noise

The engine make a noise for 2 to 3 minutes, like empty lifters. This noise start like 6 month ago. The first time that happens I looked to the gauges and the oil pressure gauge was on low and I turn the enginr off. I check for oil level it was ok. I turn the engine on again and still doing the noise but the oil prussure gauge came back to normal. What is this and how do I fix it? I dont want to break my engine. Run into a major repair.