Oil pressure switch unit leak

[ChadTaylor]

I have a 350 in my 83 k5. I had the oil pressure switch replaced and now it’s leaking oil when I start the engine. Is there a chance the shop didn’t tighten it enough? There are special sockets for this. Is there only one size?

 

[Wes Harden]

It is possible. Take the old sensor to store whether you rent or buy a tool. There are at least 2 sizes.
If the oil is coming from thead area tightening might work. It is possible to over tighten and split the threaded area, and cause a leak.
If oil is coming from metal to plastic seem the part is defective, get another.

 

[1-ton]

Sometimes the thread sealant on those parts from the factory is not enough to seal old threads.

 

[Blue85]

You can try tightening it with channel locks. Might not be much clearance for a socket anyway.

From the picture it looks like oil is coming out from the seam. If you can't tell, clean the area off and start it up again.