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RE: jumping tacho needle

To: "'2000-register@autox.team.net'" <2000-register@autox.team.net>,
Subject: RE: jumping tacho needle
From: "Köppe, Thorsten" <TKOEPPE@asv.de>
Date: Mon, 7 Jan 2002 10:16:58 +0100
Sorry, typo: equation should read 1000rpm = 15.5mph (=25km/h)

> -----Urspr|ngliche Nachricht-----
> Von: Kvppe, Thorsten 
> Gesendet: Freitag, 4. Januar 2002 12:58
> An: '2000-register@autox.team.net'; 
> '2000-register@yahoogroups.com'; 'triumph_2000@yahoogroups.com'
> Betreff: jumping tacho needle
> 
> 
> Hello & a happy new year!
> 
> After receiving a used windscreen from someone in southern 
> germany and having it fitted by professionals just in time 
> for the christmas holidays my family and I were able to drive 
> a thousand miles to visit friends and relatives without a problem.
> 
> Only one thing (that I already forgot) is a little annoying: 
> During these (mainly autobahn) rides, when driving between 
> 60-70mph the tacho needle jumps (or waves) around from 
> 2000-6000rpm. At lower and higher speeds the tacho reads what 
> it should (i.e. 1000rpm = approx. 25mph in top gear, BW35 auto box). 
> 
> This phenomenon arised when I replaced most of the ignition 
> parts last summer, including changing the coil from a 12v 
> Bosch to a 12v Lucas Gold and cutting out the balance 
> resistor (to which the Bosch coil has been connected) and the 
> ignition leads to 'high performance' leads.
> 
> The tacho is not OE but an aftermarket VDO unit which is 
> mounted to the passenger sides parcel tray. 
> 
> Any ideas, what causes this behaviour?
> 
> Best regards,
> Thorsten
> 
> 1971 2000 Mk2 Estate

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