No oil pressure!!!!
I would check the wire first and make sure it did not get cut or damaged. I don't see how an exhaust shop could have affected oil pressure unless they accidentally clipped the wire.
Sorry I am not sure how to tell you to check if it is getting actual pressure short of pulling off a valve cover.
When your ready for the 4L80e let me know. As for the Cam well... let just get you fixed up first so you don't have to get that 6.0 sooner then later.
So, I'm now on my way to building my 370 'cause my no oil pressure driving left a **** ton of brass in the oil. Just letting you know, it can happen.




