erratic spider speedo

[Pottree@domain.elided]

In a message dated 8/13/2002 7:15:10 PM Pacific Daylight Time, 
owner-alfa-digest@domain.elided writes:


> "the speedometer on my '84 spider is anything but
> accurate.  it bounces erraticlly at low speeds and will not go
> below 15 to 20 mph when stopped."
> 
> It will of course never go below the pinstop (look carefully at the gauge
> while at rest, see if the needle is resting on anything).
> 
> The bounciness could be symptoms of corroding electrical contacts (easy
> enough to clean all the wiring contacts) or of a slightly warped needle
> brushing up against the gauge plastic.
> 
I don't recall which type was on an 84, but if it's the electronic type, it 
could be a connection on the board or a transistor going (or gone) bad; if 
it's the mechanical type, it could be the fitting on the end of the cable 
(looks like a little brass nut) is worn and slipping.

The bent-needle affliction doesn't usually cause the bouncing symptom; I 
think that's usually a failure mode of the electronic speedos.

How's the tach?

Charlie
LA, CA, USA
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