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RE: Re: Tachometer reading 500-2000 RPM high!

To: mgs@autox.team.net
Subject: RE: Re: Tachometer reading 500-2000 RPM high!
From: matttrebelhorn@netscape.net (Matthew Trebelhorn)
Date: Tue, 18 Dec 2001 12:32:24 -0500
<paul.hunt1@virgin.net> wrote:

>Unless you have a significant air leak I wouldn't expect it to be caused by
>the heater, unless you drive in (and can get) internal temps of 105.  And I
>am sure that it would have cropped up before if it was solely the halogen
>bulb.  It could be that you have a marginal transistor in your tach (they
>*are* heat sensitive, I used one as a temp gauge sender many years ago).
>You could try a journey with the heater off, with the panel lights turned
>down, and a substitute tach if you get hold of one.

Any idea how to track it down, if it is in fact a bad (okay, marginal) 
transistor?  It's been a few years since I've had the case open on one of these 
tachs.  How complicated are they?

The tach is not getting all that hot -- on the warm side, but not uncomfortable 
to touch. 

Matt
-- 




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