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Fwd: Need a Cure for Bouncy Tach and Speedo

To: dpurzan@nearinc.com, triumphs@autox.team.net
Subject: Fwd: Need a Cure for Bouncy Tach and Speedo
From: Carelallen@aol.com
Date: Tue, 13 Aug 1996 21:47:26 -0400
Dan, 

Thanks for your comments. Just out of curiosity, how much did it cost to have
your gages rebuilt? Who did it for you? Was it local or did you need to ship
the gages (I am in Ann Arbor, MI). Thanks again!

Carel Allen
71 Stag
74 TR6
64 TR4
---------------------
Forwarded message:
From:   dpruzan@nearinc.com (Daniel Pruzan)
To:     Carelallen@aol.com
Date: 96-08-13 17:07:01 EDT

Carelallen@aol.com wrote:
> 
> I have a 71 Stag with gages that do not give a constant reading.  At approx
> 65mph the tach bounces + or - 500 rpm and the speedo bounces + or - 10 mph.
> The tach is electric and the speedo is cable driven. Both are Smiths gages.
I
> have the folowing questions:
> 
> 1. Is this typical problem for these types of gages?
> 2. For cable driven gages (speedo) can the cable be oiled to fix the
problem.
> If so, what kind of oil? How much? From which end of the cable?
> 3. For electric gages (tach) is there any cure for the ailment? If so,
what?
> 
> Any thoughts, comments or suggestions would be greatly appreciated. Cheers!
> 
> Carel Allen
> 71 Stag
> 74 TR6
> 64 TR4


Carel,

I am finishing the rebuild of a 71 Stag.  I had similar problems with 
both of my gauges and I sent them out to be rebuilt.  I belive the guy 
said that the gears in the speedo were bad and he replaced them.  
Whatever he did the speedo works fine now.  The tach bounced all over the 
place and tended to read high, above roughly 2500 RPM it would be pegged. 
 The rebuilder said he bench tested the tach and it was fine.  I spent a 
fair amount of time going through all of the wiring and the aftermarket 
Lumenition ignition system, but couldn't find anything wrong.  After a 
lot of frustration I talked to another rebuilder who asked to bench test 
the tach.  He said some of the circuitry was burned out and replaced the 
bad stuff.  The tach now works fine also.  Hope this offers you some 
insight.

Dan Pruzan


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