Re: Can tach be disconnectd?

[Tony Lum <tlum@flash.net>]

At 10:13 AM 11/3/97 -0500, you wrote:
>I've got an 89 Audi 100 wagon w/automatic trans. The tach started acting
>up and the needle is flying all over the place.
>
>1. Don't really need a tach on an automatic trans car.  Could I just
>disconnect it without it screwing up the input to the fuel injection
>computer (does it have RPM's as in input??)?
>
>2. How do I trouble shoot it? Is it more likely to be the tach or the
>sending unit?
>
>- hootspa
>
>

On most Audis the tach is electronic and hooked to the #1 terminal-#15 goes
to the battery (I'm doing this from memory).  Check for a loose/dirty
connection there and/or a loose/dirty connection at the back of the
instrument cluster.  I don't know about you, but a not working tach would
disturb me greatly.  I even put a factory tach into my '80 5ks with auto
tranny just so I know what rpms are normal and if the tranny's slipping.

HTH,
Tony

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Tony Lum
Fremont, California U.S.A

Audi Owner/Operator/Mechanic by Necessity ;-)

1987 5000S Turbo Quattro
1985 4000CS Quattro
1980 5000S Sedan
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