Evening gents, I was in the process of replacing my oil pressure switch-sender, but quickly realized as a 1972 OEM part it hadn't been replaced, and the unit appears to be seized. Now I'm not Bob Villa, however, I do have a decent set of tools. Any ideas on its removal/ proper tool? As always fellas your help is truly appreciated.

 

They make a special socket for that,
I bought one for about $10

 

Right. Should be available at any decent auto parts store, also.
You may want to shoot a little liquid wrench on the threads of the old one a few hours before attempting removal.

 

Thanks fellas, the help was truly appreciated.

 

Just had my engine rebuilt and am in the process of replacing a bunch of parts (water temp sensor, etc.). I can't seem to find the oil pressure switch on my 1970 Cutlass Supreme 350! Any idea or pic where it is? I have most engine components out of the car so I'm assuming it is easy to get too. Headers and starter already installed so I'm wondering if it is hidden there...

 

If you have gauges, the sender will look like the one circled in green in this picture.

If you have idiot light,s the switch will be in the same location, just a small switch with one terminal coming from it.
A special socket is used to remove it.
If someone put aftermarket gauges in, there may be a tube running from this hole.

 

Ok, yes, I have an idiot light and the item in that location has one terminal coming from it. Given I thought this was the water temp switch...Now where would that be!?

Sorry for being so naive.

 

In the picture above, the water temp switch is the gold hexagon thingie right behind the oil sender, on the manifold, just to the side of the water outlet. It will also have a terminal for the green wire (Mine is disconnected in picture)