<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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