The tachometer is part of most of modern cars' dashboards. What does it measure?
Answer The rotational speed of the crankshaft
For some reason, people are always impressed with tachometers. They are a gauge that measure how many times a crankshaft revolves in one minute. When inactive most of them read around 1,000 RPM.
Asked by Vasilii Kulev · Last updated 5 years ago · 256.6K views · SOURCE
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