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Tachometer reading 800-1000 RPM too high

To: mgs@autox.team.net
Subject: Tachometer reading 800-1000 RPM too high
From: matttrebelhorn@netscape.net (Matthew Trebelhorn)
Date: Mon, 17 Dec 2001 08:44:39 -0500
This weekend I did a little electrical work -- replaced a battery clamp, fuel 
tank sender, secured the ground to the speedometer, and installed halogen dash 
lights from Jeff Zorn.  Beautiful all around.

So this morning I came to work -- about 30 miles, with rain getting heavier the 
whole way.  About 5 miles from work, the tachometer started reading high -- 
showing 4500 rpm at 60-ish mph.  When I stopped at a light and let the car 
idle, it showed 1500 rpm.

The car is a '70 B roadster.

Any ideas as to what might cause this?  Is it a problem with the heat generated 
by the halogen bulbs in combination with my heater/demister?  Is it a problem 
with water getting into the instruments?  

Any suggestions appreciated.
Matt
-- 




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