Originally Posted by erik11876
Unless your engine is hitting temps of +400 degrees F, your good. I could be they didn't clean off the fluxing agent well enough and contaminants have made a high impedance short between the two conductors. That would be my guess.
You can warp an aluminum head at far lower temperatures than 400* F. Ask me how I know. He also wasn't complaining about overheating, he was complaining about a temperature fluctuation---either real or a result of a faulty sensor/wiring.