As the AI infrastructure buildout and global geopolitical developments spur massive spending, an old-guard sector of the economy is getting a level of attention from investors that rivals the action in tech. The industrials sector of the S&P 500 is trading at a price-to-earnings ratio above 30, a level investors more often associate with high fliers, and a P/E ratio that is well above industrials' long-term average, which is closer to 20.