today i was trying to get the temp sensor out of it's spot in the intake manifold, and noticed it's siezed. i tried every set of pliers, wrenches, and vise grips, but i couldn't get it out. in fact, the edges of the nut were giving out. probably has something to do with it being a cheap aftermarket temp gauge adaptor. not even using wd-40 helps

any other ideas for getting this sucker out, i'd kind of like to get my gauges working again. i thought about using a torch or some kind of heat to get it out, but i really don't want to screw anything up