Skip the auto shop - Our mechanics make house calls

Q: How does the tachometer work?

asked by on

How does the tachometer work?

A: Your central gauge cluster shows you a wide...

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.


  • 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 1000 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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: What does the door and trunk open warning mean?

There are quite a few different warnings and indicators that can be displayed in your vehicle information center. If you see an indicator that looks like the outline of a car with one door open, and words “Warning Door Open”,...

Q: What type of spark plugs should I use?

Spark plugs might not be the first thing you think about when it comes to engine performance, but they should be close to the top of that list. They’re essential – without operable spark plugs, your engine has no way...

Q: What does the headlamps warning chime mean?

The Headlamps Warning chime is a helpful reminder that your headlights are on. Leaving the headlights on would drain the battery, so it is important to always turn them on. To understand the Headlamps Warning chime. The Headlamps Warning...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.