I was wodnering if anyone has ever drilled and tapped their oil pan drain plug for installing an oil temp sender? If so how did it go? Are there any companies that make pre-made drain plugs (I've heard they exist, I just don't know who makes them)? Will I encounter any problems trying this? I'm guessing I could get an OEM bolt, and drill through it using a lathe, but I would be reducing the amount of material in the plug by quite a bit (Although I doubt the plug is stressed alot). I belive the sender is 1/4 NPT or 1/8 NPT, I'm not sure.