Q: How does the tachometer work?

asked by on

How does the tachometer work?

Your central gauge cluster shows you a wide range of important information about your car, your engine and your transmission. The tachometer tells you a couple of things. First, it shows how rapidly your engine is turning, which is measured in revolutions per minute, or RPM. Second, it shows you when the engine is getting close to critical speed – the red sections at the upper end of the dial.

Tips

  • The engine’s RPM will change as the transmission shifts gears.

  • Do not let the needle move into the red section of the gauge. This is dangerous and can lead to engine damage.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. How does the tachometer work?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: v6 vq35 engine is making a Squeaky sound?

Usually squeaking noises are associated with the drive belt. I was unable to access the You tube Video that you tried to link, but I'll speculate that you are hearing a slipping serpentine belt. If the automatic tensioner has started...

Q: My tachometer gauge needle is pointing straight down, and it won't start.

Hi there. Check the crankshaft position sensor and see if there is power to the sensor. If there is power to the sensor, then put leads from a digital meter on the sensor and crank the engine over. Check to...

Q: How do I check the coolant level?

Checking the coolant is an important part of keeping your vehicle well maintained. To check the coolant, follow these steps: 1. Open the hood, when the engine is cold. 2. Locate the engine coolant reservoir. 3. Look at the fluid...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.