Even if we ignore different sector we need to look at the financials. Google dint have much debt. Tesla on the other hand has lots of debt. Their financial leverage is 5.97 which is high.

Then there is also about the interest rate climate. We have seen years of unprecedented low interest rates. Feds now have started to increase it slowly. If it rises too high Tesla's interest obligation will balloon as well. If they are not building cars fast and selling them even faster, they might be a deep hole and hence overvalued.