I carried a handgun in my vehicle here in Okie-land for decades, even prior to legal CC laws being in effect. I'm not advocating any behavior for anyone else, but there you have it.

I never had any problem. Granted, I rarely get pulled over. However, on one occasion many years ago, I had to get in the glove box to access some paperwork asked for by the Okie Trooper that did pull me over. I told him straight up that there was a handgun in the glove box. He told me to move carefully, and put it on the passenger floorboard.
I did, he finished his business, and we parted ways. I did not get a ticket. Nothing else was ever said about the gun.

My opinion - I'm not going to travel defenseless. That's it.

Oklahoma is a fairly gun-friendly place. Don't drive like an idiot, don't act foolish in public, you will be pretty much left alone.