2 issues occurred after installing long tube headers

What is your question?

I recently installed long tube headers in my 2015 Mustang Gt along with a tune. Upon starting it I got a low oil pressure light about 10 seconds after turning it on. I immediately turned it off and checked my tuning device and I had two engine code, both high and low oil pressure. both showing at the same time. I replaced the oil pressure sensor as well as a oil change w/ filter and that did not fix it. Wiring looks good as far as I can see so I'm lost on what it could be. 2nd issue is that the gear selector is stuck in park unless I use the interlock override under the boot trim so I know the actual cable is fine. I am hoping this issue is what is also causing the paddle shifters to not work as well. Both of these issues happened immediately after install, and worked perfectly before so I'm not sure what happened. I did take it for a very careful test drive and it did great both in feel and sound. overall I'm lost on what could be causing them and would appreciate any feedback.