Hi Keith,
In order for Nissonger or anyone else to check speedo calibration, it is
necessary for you to furnish the CORRECT "revolutions per mile" for your
particular car. There are a number of 'possible" calibrations for the
cars. Only one of which is correct.
The revs per mile is printed on the speedo face, something like 1325 for
a 4.11 axle ratio & standard original diameter tires. Other axle ratios
& tire diameters will come out a different number. If your axle ratio &
tire diameter don't match the intended speedo revs per mile, the
calibration will be wrong. Obviously if the speedo or it's calibration
or the axle ratio have been changed somewhere along the way, things will
not match up.
Instructions for measuring your actual revs per mile have been published
a number of times. Only by furnishing this correct information, can
Nissonger verify calibration.
I would discuss the problem with Margaret Lucas, as suggested.
Regards,
Dave Russell
pennell@cox.net wrote:
> Alan,
>
> Don't know as I can agree with this. I have a speedo which has been
> reading very high as well. Sent it to Nissonger and they said the
> speedo checked out fine. Reinstalled it and it still reads high.
> Wish I knew what do do about the situation.
>
> Doug, if you get any private replies please forward to me.
>
> Keith Pennell
>
>
>> Doug -
>>
>> If the needle is working sporatically and it is reading too fast,
>> the only thing that would cause that is a bad speedo. The speedo
>> is a very sensitive & somewhat complicated instrument and it won't
>> take much to have it give you the symptoms you describe. I would
>> recommend having it rebuilt. Try Margaret Lucas at Mo Ma in New
>> Mexico. Her prices are fair and she knows what she's doing with
>> Smiths guages.
>>
>> Best Regards,
>>
>> Alan
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