Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. 3 Essential Things to Know About Your Car’s Tachometer

3 Essential Things to Know About Your Car’s Tachometer

tachometer

The tachometer is located on the dashboard next to the speedometer. It measures the revolutions per minutes (RPM). The tachometer can be a digital display or on a calibrated analogue dial. They are on both automatic and manual vehicles.

Purpose of the Tachometer

The tachometer shows the rotation of the engine’s crankshaft. The purpose of this is to help the driver in choosing the right throttle, and gear for driving conditions. For vehicles that have analogue dials, the danger area is marked in red. If the tachometer is driven in the red for too long, this can cause overheating, inadequate lubrication, and excessive wear on the engine. This can shorten the lifespan of the vehicle or cause the engine to fail.

Parts of the Tachometer

The dial of the tachometer has numbers ranging from one to seven on most vehicles. An indicator points to the numbers showing where your RPM is at while you are driving. There is a yellow area that means you are just starting to enter the danger zone. The red zone is normally around numbers six and seven and is the danger zone.

Potential Problems with a Tachometer

A blown fuse is a potential problem with the tachometer. Check the fuses to ensure they are properly functioning. Bad wiring can also be the cause of a malfunctioning tachometer. If you are getting erratic readings, this can be a sign of bad wiring. Another potential problem is calibration issues. If you notice the RPM readings do not coincide with the motor, then it may be time to have the mechanic look at the vehicle. By doing so, they can diagnose any problems that are going on. If you have a digital display, the LED lights may go out on the tachometer, or may not display correctly. Typically, a burned out LED is the cause of this. If you are still having issues with the tachometer after troubleshooting various problems, you may just have a bad tachometer. If this is the case, the tachometer needs to be replaced by a professional.

The purpose of the tachometer is to read the rotation of the engine’s crankshaft, which is shown in RPM. It is located next to the speedometer. If the dial goes into the red area, there may be a problem with your engine or the tachometer. If this is the case you can contact YourMechanic for an inspection.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...


Related questions

Q: My tachometer isnt working correctly

The two most likely causes of this issue would be the sensor that controls the tachometer or the gauge cluster itself. I would recommend having the sensor inspected and tested first to determine if it is performing correctly. If the...

Q: Interior is falling apart, need help

Walk through any classic car show, glance at a car's interior, and usually the most prominent, gleaming feature of a 50’s vehicle will be the dashboard: beautifully painted metal, adorned with brushed aluminum or chrome, shining brightly. Sadly, while being...

Q: Throttle problems at start

Your vehicle does not have mechanical throttle linkage. Instead, it is equipped with a "drive by wire" system, which uses a stepper motor to control throttle position. My guess is that the problem is somewhere in this system. Throttle initialization...