Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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Tachometer needle jumps to the high post position at normal revs and flips back and forth for no reason.

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The gears inside are made of plastic now-a-days, Some gear teeth have got worn out or broken which is why your tachometer needle is jumping in a haywire fashion...................sodeep

Posted on Jul 01, 2009

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The tacho signal is taken off the coil, not off the engine - I would suspect a dodgy electrical connection or dodgy tacho

Posted on Jul 01, 2009

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1 Answer

Battery went dead so I jumped it with a power pack 350 amp. It starts but runs rough and eventually dies and all lights flash and speedometer needle jumps back and forth.


Sound like your alternator is shot. Do the test ..After you charge the batery or get it boosted if you remove the positive battery post OFF the battery and the engine dies right away your alternator if shot .

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The O/D light on my dash board is on. What does this mean please?


O/D is "Over Drive". This is the recommended transmission setting when driving normally. You should disable O/D when towing a trailer, when climbing hills or when the transmission is "hunting" (shifting back and forth over a very short period of time).

O/D provides maximum fuel efficiency by allowing the transmission to shift to the highest gear, quickly. When O/D is disabled, the transmission may not shift to the highest gear range and it may take longer for the transmission to shift into the highest gear supported.

You can see / hear this by looking at your tachometer (or listening to the engine rev if no tachometer) with the O/D on at any speed. Shutting it off should cause the tachometer to jump up noticeably (or hear the engine rev up) and the car should begin to slow almost immediately. You'll need to step on the gas to maintain the speed when you switched it of. This additional fuel is what you saved when in O/D. The up side of O/D off is more responsive acceleration - but at the cost of fuel efficiency.

I hope this helps :-)

Oct 23, 2015 | 2002 Mazda Tribute

3 Answers

The rev counter in my 2000 corolla is reading incorrectly


Macsry2k answer makes the the most trouble shooting sense. Problem is definitely electric. Since the alternator is where the RPM reading comes from, this is the best place to start. Good luck!

Jun 08, 2015 | 2000 Toyota Corolla

1 Answer

What would cause temperature gauge bouncing ?


Sounds like the sending unit has an intermittent short to ground. Unhook the the wire from the sending unit, and see if the needle stops jumping around. If it quits jumping around, replace the sending unit. If it still jumps around, you have a bare spot somewhere on the wire and it is hitting ground which will cause the needle to jump. Cut out the bad part of the wire and splice in a new section. That should fix it.

Jul 20, 2014 | 1996 Buick Century

1 Answer

My Yamaha r1 1998 rev counter goes back to 0 when the throtle is open to the max, but back it up a bit and it goes back to where it should indicate. The bike is running normal, even if the tachometer goes...


it is your exup valve it may be sticking or a cable has snapped it does it a lot on r1s it has 3 fault codes rev needle goes to 7 for exup valve 3 for some thing eles and 4 for another fault

Aug 15, 2012 | 1999 Yamaha YZF-R1

1 Answer

My battery went bad in my 1998 Buick Park Avenue and the auto shop tried to jump it which cause my speedometer, tachometer and gas gauge to flip rapidly left and right. The gas gauge flipped to the right...


The instrument cluster is a sealed unit, do not recommend taking it apart for that. What I would do is drill a small 1/16" hole near where the stop pin is through the plastic outer cover and use a paper clip or sewing needle to move the fuel guage needle back to the other side of the stop pin. Reseal with a drop of super glue to keep dust out of cluster.

Jun 08, 2011 | Buick Park Avenue Cars & Trucks

1 Answer

The needle is going back and forth and car seems to wants to shut off.


Specifically what Needle is going back and forth? You need to be more specificfor anyone to understand what your difficulty is. Are you speaking of the Tachometer? Speedometer? Oil Pressure Gauge? Ammeter or Voltmeter? Temperature Gauge?

Fastest Robe

Sep 26, 2010 | Chevrolet Prizm Cars & Trucks

1 Answer

Car revs higher than normal at about 30mph even though in top gear and tachometer doesn't show abnormally high reading.


You may have a defective tachometer gauge stepper motor, making the tachometer show incorrect RPMs.

Jun 25, 2010 | 2002 Chevrolet TrailBlazer

2 Answers

Charging gauge bouncing back and forth starts after jump


sounds like a shorted field in the alternator

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