So I have a question. I read that a cause of a flickering oil Guage is most likely the pressure sensor. I replaced the pressure sensor today and I drove it to a friend's house. The oil Guage stayed in the middle all the way there with no problems. On my way back home it started flickering worse than before and even going down so low the check Guage light was coming on.it never did that before I replaced the sensor. So I am wondering if anyone would possibly know what the problem could be.

 

That depends. What year and size engine do have?

 

It is a 2003 and it has a 3.0 flex fuel

 

Let me see if I have this right. You had a flickering oil gauge so you replaced the sender unit. It is still flickering only worse now. You might want to pull the cam sync and check it for wear. Usually when it starts to fail, people complain of a chirp or squeal. That doesn't always happen though. It can significantly wear at the gear at the bottom of the shaft. The cam sync turns the oil pump shaft. The camshaft turns the cam sync. There is always the possibility you bought a bad sender too, or have a bad connection. What you don't want to happen though is for the cam sync to fail while you're driving. Could cost you an engine. Inspection is prudent especially if you have high mileage and the sync is original.

 

That is exactly it. And thank you so much I will be pulling that out and checking that next. And it has 209,000 miles on it so if it is the original then it definitely wouldn't hurt to change it out

 

The other thing that I did notice today is the Guage goes crazy when I am sitting still. If I raise the rpm or drive it stays in the middle. It's like it only does it when it is at idle

 

The gauge is a "dummy" gauge. It doesn't tell you your actual oil pressure, it just tells you have oil pressure; even if it's only 5 lbs of oil pressure it will still read in the middle. lol.

I would definitely inspect the cam sync on a 209k motor, especially if you haven't replaced it in the time you've owned the truck.

I put an oil pressure switch on my 2003 around 2012 or 2013, and it just recently failed last year. So if my replacement only lasted 7 years or so, I wouldn't be surprised if your "new" switch is bad out of the box. Most aftermarket auto parts are cheaper than dealer parts because they aren't tested. They're just mass produced and sent out into the world. That's why they also usually carry limited lifetime warranties, because they expect a certain amount to come back from defects.