P0098 Code and oil pressure loss at idle
 

Help,

I have a 06 f250 6.0 powerstroke with about 150,000 miles on it.
Its been a very strong running truck until this few weeks.
It started back once in December, we started the truck it was fine,
once it warmed up and the clutch was put in for a few seconds the oil pressure gauge
dropped to low but once engine was reved the pressure gauge shot back up to normal.
We immediately returned home and checked oil level it was perfect. We let it sit for the rest of the evening and most of the next day and it never did it again. Its been good until now.
The oil gauge is fine until the engine warms up (about 10 mins or so), but now once warmed up it will drop on idle and not go back up until reved.
It did this then the check engine light popped up and we hooked it up and it threw P1102-mass air flow sensor in range but low, and P0113-intake air temp. sensor circuit high input.

So we cleaned the mass air flow sensor and cleared the codes. Ran the truck for about 20 mins to town and back and once home, engine was running pretty hot. We hooked backup scanner and it threw another code P0098-intake air temp sensor circuit open or short.

We left the truck for about 3 hours or so and when returned it was still really hot. The coolant temp was still 138. I was going to install a new mechanical oil pressure gauge but couldnt since it was still way too hot. Is it a good place to install the gauge on the oil pressure switch, next to the oil filter?

I'm not sure what to do from here I've tried looking up what it could be but not much luck. If someone might know something please help me out.

Thanks