Thanks for allowing me to join. I stumbled across this forum.

I have my transmission out and seems all freeze plugs are leaking. I have a leak on the back passenger side head but there is a bolt looking thing with a wire attached to the top can anyone tell me if this unscrews and what it is? Thanks for your time.

 

Oil pressure sending unit

 

Thank you... What are the chances of it snapping off if I try to get it out