Sensors for high temperature warning lights are different to those used for gauges and operate only as switches. They only pass a current to the light when a pre-set temperature has been exceeded.
On the day you take it home, bring friends to lift it in and out of the trunk, and bring tarp or cardboard to protect your car. An engine block is greasy and can leak fluids even if its been in a garage for years. Heres what my engine blocks looked like when I brought them home (we had cleaned them before putting them in the trunk with a water jet)
 
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This odor becomes overpowering when you pop the hood, even if you can’t see the oil burning. Whenever you smell burning oil, you should assume that there is a risk of a car fire and stop driving immediately.
Tightening the valves too much will also disrupt the function of the engine. So, the debate is not tight valves vs. loose valves but finding the perfect spot that ensures the engine's best performance.
Fix a Dim Headlight.
In this guide, I evaluate the RPMs in depth. I show you the symptoms of idle speed problems and give you some ideas of what might fix it.