Bruce, If you have a 1/2 " correct sending unit and want to send it, I will get it out. An allen wrench I had went in pretty tight, I had to tap it but it fit snug. I will weld the allen wrench to the plug and turn it out. I had to weld a wrench to my sons drain plug on his 05 grand prix when he bought it because the dealership buggered up the plug getting it out. If not I can get on at the parts house. If that dont work, I will get the other hole ready and use it. Let me know.[/QUOT
A 3/8 extension is what is supposed to work in these plugs. Because of corrosion you would need to grind the tip of the extension to get it to fit. Don't grind too much it needs to fit snugly. Tap it in with a hammer. That's how I got mine out.