[T3] stumped

Keith Park topnotch at nycap.rr.com
Sun Dec 1 08:20:06 PST 2013


Interesting, so you do a comparison calibration.  Sounds logical.

Keith


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-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of Jim Adney
Sent: Sunday, December 01, 2013 1:24 AM
To: type3 at vwtype3.org
Subject: Re: [T3] stumped

On 30 Nov 2013 at 11:29, Keith Park wrote:

> How do you get the needle back on the shaft in the right spot for accuracy
> Since the shaft isn't indexed?

That's a secret! But I'll let you in on it.  ;-)

In the first place, I marked where the needle pointed before I 
removed it. The shaft position will be random, but I can put the 
pointer back where I found it.

But, I don't trust that to be at all accurate.

So here's my plan:

I'll grab a few of the speedos I have here, with the same ratio, and 
drive them with my drill press to see what speed they indicate. I 
have 4 fixed speeds, so I hope I can pick one that gives me something 
within the range of 30-60 mi/hr. Then I will move the needle on this 
speedo until it agrees. That gives me accuracy at one speed; the rest 
depends on the strength of the spring and the strength of the magnet. 
Since I can be careful not to change either of those, I should be 
back to the OE VDO calibration, or at least very close.

Real speedo shops have equipment to adjust the strength of the 
magnet. I've watched it being done, but I don't have that equipment.

-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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