Re: Speedo drive gear

I do not know the different color speedo gears and so cannot answer your
specific question...

I can give a bit of other info that you might find helpful, though...

Here's my take.  Take it with a grain of salt as I am not a speedo expert
but have adjusted a couple to read reasonably well.  I assume that your
speedo is a uniform 4 MPH fast as otherwise you would have given several
speedo/gps readings.  Unfortunately, if the speedo is a uniform 4 MPH off
then the speed of the cable is actually correct for your speedo but
incorrect for your odo.  All you would need to do to get the speedo to read
correctly is pull the needle off and the install it 4 MPH lower and 'bob's
your uncle'.  Unfortunately as the odo is directly geared and the gearing
is incorrect, so you will need to change the speedo gear on the end of the
cable in order to correct the odo.  That gear change will then make it so
your speedo is variably inaccurate.  It will read the same 4MPH fast at
first and then gradually get to the point where it is correct and then at
higher speeds it will read low...  You will need to mess with the speedo
adjustment to get it to read correctly AFTER you get the odo to be
correct.  Increasing the spring tension will cause the speedo to read
progressively lower.  Decreasing the spring tension will cause it to read
progressively higher.  Once you have the speedo spring adjusted so that it
is again consistently incorrect across the range of speeds, move the needle
so that it is then consistently correct.

On Sat, Dec 13, 2014 at 9:54 AM, <[email protected]> wrote:
>
> OK, I finally have a working speedometer in my Jetta again.  Now, I would
> really like to fine tune the speedo as it is just a bit off according to
> the GPS.  It measures about 4 mph fast and the odometer is high by about
> .16 miles.  So…..I currently have the red speedo drive gear  in my ACH
> transmission because that is “the one you are supposed to use”.  Would
> changing to the white drive gear speed up my measurement or slow it down?
> Obviously I need to slow the thing down a bit.   So what say the gurus?
> Hayden
>
> "God is not a diviner being or a magician, but the creator who brought
> everything to life. Evolution in nature is not inconsistent with the notion
> of creation, because evolution requires the creation of things that
> evolve.” Pope Pius XII
> “There are many men of principle in both parties in America, but there is
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> “I cannot help fearing that men may reach a point where they look on every
> new theory as a danger, every innovation as a toilsome trouble, every
> social advance as a first step toward revolution, and that they may
> absolutely refuse to move at all.”  Alexis de Tocqueville
>
> Proud owner of:
> 2014 Jeep Grand Cherokee Ecodiesel
> 1968 Beetle
> 1982 VW Jetta Coupe GTD "FrankenJetta"
> And many, many, many VWs; from a 1947 Beetle (13 Beetles total), to Vans
> (5 - 3 splitties  2 bay window (both were campers), 1 Vanagon Westy,
> Rabbits (3), Karmen Ghia (1), Jettas (11), Passats (2), Dasher (1), New
> Beetle (1), Rabbit Convertible (1) and Rabbit Pickups (3) most now gone but
> not forgotten.
>
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