oil pressure sender

What is this opening on my 2.9? I got down there to clean and change the oil sender unit and noticed there's a deeply recessed port. Not sure if it's the norm and I'm just overreacting but I don't want to run to pick n pull to check without asking first. Any clue what this is and if there should...

i want to know where i need to install this new gauge/where to thread it in, if someone could put a good picture in here in where it threads in that would be much appreciated

Having problem the red oil light cant figure how to turn off. I have been told its the light for oil change. It is just called an oil light in manual. I have tried the hold speedo down 5 sec there isnt a menu that comes up. I have had several oil changes they dont have a clue. I know its...

One of the quirks about my "new" 99 Ranger with 4.0 was that the oil pressure gauge needle was on the wrong side of the peg. Today I pulled the dash apart to replace the 6 burned out dash cluster light bulbs. While in there I slid the needle off its shaft and replaced it with the needle resting...

i've got a '90 ranger with a 2.3L (stock motor) w/ the dual plug head. after shaking my truck on a back road like a bad parent giving their kid shaken baby syndrome, my oil pressure gauge is now possesed by a skizophrenic demon. the needle goes from between the r and m on normal to "there is...