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The speedometer is required by law.

The Tachometer is a good idea as it indicated the engine speed in RPM (revolutions per minute) and allows you to monitor the engine in a very quiet car or over modern stereos.

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15y ago

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Why would 2000 Chrysler Sebring both tachometer and speedometer stop at same time. The tachometer shows rpm of 5-6 and will not shift?

check the fuses.


Why would a speedometer odometer and tachometer all fail on a car at the same time?

its probably a blown fuse or relay


How do you repair speedometer and tachometer?

If they have both failed at the same time it sounds like a power supply problem. Check fuses


What would cause all the instrument panel gages like the fuel temp tachometer and speedometer to stop working at the same exact time?

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How do you tell how fast you are going if the speedometer is broken?

Use a GPS ^ posted by someone else What you want to do is drive with traffic and watch your tachometer. That is the RPM gauge, if your car has one. By marking the tach you can tell your approximate speed at any given time. You need to watch what RPM's you shift at, if you are in fifth gear cruising at 55mph then look at where your RPM's are... they will always be really close that in 5th gear at 55mph. You can then use that as an easy way to tell your speed with a broken speedometer.


Why does speedometer work part time?

Family commitments


What causes a cars speedometer to sometimes not work and the car to lose power and the engine light to come on all at the same time?

Have vehicle scanned to determine the problem


How do you diagnose and fix the speedometer that only works intermittently on a 1996 Nissan truck?

Hi There, On my 1995 Nissan Pick-up, The speedometer as well as the tachometer would intermittenly stop working. Sometimes one would work then the other would stop working, sometimes both stopped working at the same time. I never knew when it would happen. Then, at 90,000 miles, the Check Engine light came on and everything worked GREAT. It turns out that the wire that sets off the Check Engine light was shroting out causing the problems. It was fixed today for a cost of $160.65. It worked for me, I hope that it works for you. Good Luck!


Your speedometer doesnt work all the time like if it wasnt connected?

Your speedometer might not be connected if it does not work. It might also have blown a fuse if it is an electronic speedometer or it could have a wire that is loose.


What causes the speedometer and the odometer to stop working at the same time on a 1993 Buick century How do you fix this?

The logical problem - would be a broken speedo cable. The speedo & odometer are both run from the same cable.