[T3] Recalibrate speedometer

[Dave Hall]

On the speedometer problem, the needle is spring loaded back to zero (past
it really), so it's not easy to reposition with accuracy.  Maybe someone
fiddled with it, which is why it reads fast. The needle is quite thin, and
fairly easy to damage. If the perceived low gas mileage is something to do
with the odometer, that must also by turning too fast, reading too many
miles.  I think you said the odometer was OK (eg compared with a GPS), in
which case the low gas mileage may be nothing to do with the speedometer.
It could be simply due to low voltage output from the voltage regulator
(seems odd but it's one of the most common reasons for poor mileage with FI
cars.


A diagram showing the fuel sender and some advice on diagnosis and repair is
on my website at
http://home.clara.net/hallvw/fuelsend.htm  
It's written for UK owners, so you may need to find your own sources for the
things in the links.

Grounding the wire from the sender with ignition on should give full scale
deflection on the gauge (certainly close to full anyway).  If it doesn't,
there's something wrong with the gauge side of things, not the sender, or
it's not grounding properly.  If the sender is suspect, it may be a dirty or
broken wire, corrosion in the joints or the connection to the casing.  

Depending on what's actually wrong, it may be simple or tricky to repair.
The wire is very thin and easily broken, even when being careful!


Dave
UK VW Type 3&4 Club
===================

-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Jacob Adam Schroeder
Sent: 09 May 2015 15:33
To: type3 at vwtype3.org
Subject: Re: [T3] Recalibrate speedometer

Thanks for all the replies.  So far it seems to be a linear issue and by
that I mean that it is always off by 10 mph.  It is annoying, but I have
other issues to troubleshoot in the meantime that are a higher priority.
I'll likely return to this at some point down the road.

I really only started noticing this issue because my fuel gauge has started
acting up and I have been relying on the odometer to measure my mileage as a
proxy for how much fuel I have left.  Using the odometer, my gas mileage
seems low, and that got me thinking.  My fuel gauge was working recently, so
I will focus on getting that going first and will likely start a new thread
about that.

Jacob
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