I have a Nissan Titan 2006, I noticed that the engine oil pressure stays on the High side if running and stays in between Low and High when its on idle. Can you help please?

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Replace oil pressure sending unit. Sender is located on the engine block close to the oil filter. Usually has one wire connected to it.

When you say it was "normal" with the engine off and the key on, do you mean normal as 40-50 psi, or normal, as 0 psi since the engine was off and there should be no oil pressure? This is important because if you are reading 40-50 psi with the engine off, it is not surprising that the gauge goes "too high" once you start the engine. If the gauge is at 40-50 psi with the engine off and the key on, then there is a problem with the gauge or the sensor. It is not an overpressure issue. As long as the engine seems to be running normally otherwise and is not clacking internally or other such things that would indicate oil pressure issues, I would feel safe using the vehicle until I could have the oil pressure circuit diagnosed and repaired.

Take it to some place like autozone and have them read the codes for free, that will tell you what the issue is.

try replacing the oil pressure switch

I have a Nissan titan 2006, I noticed that oil pressure gauge is right in the middle but once you start running the gauge goes all the way up high. What is wrong?

How high are we talking? You have verified this is the correct pressure with a mechanical test gauge? If not do that first, if the pressure is normal then replace the sending unit first.

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titan engines are pretty bullet proof. we dont see any issues with those. what oil grade are you using?? it calls for 5w30. If you are ok there, than i would look at the oil pressures sending unit first. about $40 piece. nothing expensive. i would rool out engine issue or oil pump problem.

Yes the oil pressure sending unit sounds like its bad they go bad from time to time the oil leak gives it away