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5/24/13 3:03pm - Original Message: 'Speedomter and odometer'
Former Member
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1969 corvette stingray - 427/390 HP - 4spd

Joined: 5/24/2013
Posts: 1
I recently purchaased a 69 427/390 ho 4spd car. I love it, been waiting and saving 20 years for a car like this....All is good except a couple minor things.
1. Speedo was jumpy and is still jumpy and off by about 20MPH
 - Any recommendations on how to fix this
2. Odometer was working just fine then all of a sudden stopped
- Any recommendations on how to fix this
3. Voltage gage - Does not work
- Has an aftermarket alternater and the gauge is new.
My undersatnding is this is because the new alternator has the bulit in voltage regulator?
Any truth to this and what can I do to get my voltage regulator up and running?
Any advise and or recommendations would be much appreciated !!!!
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5/24/13 5:59pm - Reply: 'Re: Speedomter and odometer'
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Zachary, LA - USA

1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
Congratulations on the car!  Your first Vette is an awesome one!

Jumpy speedo is usually an old, kinked, and/or dry cable.  I believe the '69 cable is two pieces.  You may want to disconnect it at the transmission, hook up a cordless drill to it, and spin it.  Do it again at the halfway point.  It may tell you that the cable needs replacing; you may even be able to hear it making noise as you spin it (not good). You need to spin it backwards for it to register.  Depending on the drill, you'll only get about 20 mph.

The speedo being off could be a number of things.  Someone could have changed the rear gearing or swapped transmissions.  Or it could be just a fubar gauge.

Odometer: no clue.  If the cable isn't your problem, you may have a bad speedo.

As far as the voltmeter goes, if it's a regular voltmeter it will have nothing to do with your voltage regulator.  It'll show whatever buss voltage is wherever it's hooked up.  However, with the car off, it should read lower than with the car running to show that the alternator is doing it's thing.

Removing the speedo is not a trivial exercise.  You'll have to drop the steering column, remove/loosen the center stack, lift the dash pad, then pull the gauge cluster.  Then there are the 15 or so light bulbs plugged into the gauges, as well as the vacuum lines for your headlights and wiper door.  Which is a long way of saying that if it was my car and I could fix the jumpy speedo with a new cable, I'd live with the broken odometer.

Good luck!


"Let them that don't want none have memories of not gettin' any."
- Brother Dave Gardner

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