ok here is the old post
https://www.camaroz28.com/forums/sho...d.php?t=559178

i tried to put the oil pressure sensor in the green circle is that the right one to put it in bc if it is it would not fit on mine i don't know what i am doing wrong dose it go in the blue circle hole or what

 

i am almost 100% that the blue is the one you wanna deal with

 

then what dose the green hole for ?

 

The blue hole is the correct one for the oil pressure switch. I'm not sure what the green hole is. My guess is that it's just threaded into the block and is used for mounting something.

 

i still have no clue what the green hole is

 

I know the blue hole is where you mount the oil pressure switch because I have a mechanical oil pressure gauge attached to my car right there. You have to remove the plug. I don't know what the green hole is either, but I would guess it's a mounting point for something.

 

I think the green hole is for mounting mechanical clutch linkage as I remember seeing it being used for that on a sbc350 in the 70's. I could be wrong.

 

but see the green hole goes all the way in the block so nothing like oil or coolant will come out of it ?

 

Blue hole is the one you want for sure.. Don't worry about the green one.. You'll never use it. .