Oil pressure concern

I'm feeling out of my comfort zone in regards to what I'm noticing oil pressure wise.
When I began to drive my truck back in January 2019 outside Temps were very or extremely low so I had no concerns. Since we have 50s and 60's hitting now I'm concerned about my oil pressure. Please feel free to comment based on my recent findings below
Year:
2012
Engine:
Maxxforce 13
Milage:
245k
Motor oil:
Mobile Delvac 1300 15W40
Last oil change:
5000 miles ago
Filters:
Both media and the spinner bought at the dealership by Vin#

Oil Temperatures observed:
Cold start: 90psi
190-195 degrees: 17-18psi
200 degrees: at idle 15psi and 55psi at 1600rpm
215-220 degrees: at idle 12-13psi and 50psi at 1600rpm
Those numbers are based off of NED software. I'd feel comfortable with minimum of 15psi at 220 degrees. I'm afraid that when we get into 80s-90s the oil pressure will drop even more. I have not tested it with mechanical gauge yet.
I'd hate to go as far as digging in crank and main bearings also oil pump since it is internal oil pump (I think) would require front cover being removed?
Engine runs great, no funny noises
My question is: What can I do/replace to start with. My thoughts are oil pressure sensor, oil pressure valve kit. Are there any other items that I can check out/replace myself?
Thanks in advance, Jacob

 

Interestingly I was considering Mobile Delvac 5W40 full synthetic for my next oil change as I've recently read in maintenance manual that this type of oil is recommended for all temperature range where 15w40 is good down to 20*F only. I do use block heater whenever Temps go under 32*F so not much problem here however synthetic offers best fluidity in cold and better resistance to temperature breakdown when hot.
I'll do mechanical gauge test as soon as opportunity presents itself, I may buy me a gauge though.
I also thought that oil cooling is insufficient but based of the latest oil temp test I never went over 209*F
Nonetheless, I appreciate you taking the time to respond.
I'll update with results, Jacob

 

Came back from the steelership empty handed. This oil pressure sensor is $300. I already know that parts ain't cheap for this particular engine but come on, oil pressure sensor made in Germany was $280 and one made in US was $310, that's steep. Luckily I was able to locate one online for $50, lol

 

Sorry Heavyd, no harm intended rather poor choice of words, it's a leftover from my early days when I was young and broke. I guess I tried to vent, that's all.
I was taken by surprise when I was told $300 for the sensor and I bought many of them in my lifetime but never in that price range,
Moving on, you know that me and bunch of people on here (probably not only here) are very much appreciative for what you do, there's no question in my mind and for that reason accept my sincere apology, Jacob

 

A little update on oil pressure issue,
Recently did oil change (Delvac 5W40 synthetic) however didn't notice change for better if anything it seems as the engine falls into lower Psi range quicker at higher temperatures. Oh and forgot to mention that new oil pressure sensor was installed while oil change was done.
My new numbers are:
13-14 psi @200°
13psi @205°
12psi @206°-217°

While doing oil change when replacing oil filter cartridge, the new one came with orange o-ring however I couldn't find the use for it. Is there any use for that o-ring? I thought that since is not installed it may be causing a pressure drop. Any thoughts on this subject?