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.
----- Original Message -----
From: "Matthew Trebelhorn" <matttrebelhorn@netscape.net>
To: ""MG Digest"" <mgs@autox.team.net>
Sent: Tuesday, December 18, 2001 1:35 PM
Subject: Tachometer reading 500-2000 RPM high!
> So I'm guessing now that this is heat-, not rain-, related. Last spring,
I put in an MGOC heater core, motor, and fan, as well as a version of the
Bob Muenchausen's heater valve. http://hometown.aol.com/akamrmg/index.html
>
> That combo makes the heater pretty effective -- but now it seems that,
along with the halogen instrument bulbs, it makes the tach run hot, and show
excessive revs.
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