I think the 79 had an electronic tach and there is a little lever that will
"trim" the tach. If it is all the way up it could indicate double at idle.
Sam
At 05:48 PM 10/17/1999 -0400, Tony Rhodes wrote:
>Frank, One question, does the tach read zero with the engine off?
>
>If so, there is something seriously wrong. It may be fixable.
>See http://ourworld.compuserve.com/homepages/arhodes
>
>This has a speedometer repair manual. The actual speed indicator
>in the speedometer is just like the tachometer works. The tachometer just
>does keep
>count of total engine turns.
>
>In short, there could be something binding between the magnet wheel and
>the pointer
>spindle or the "drag cup". If the magnet wheel is pushed too far forward
>toward the dial,
>it can induce too much drag on the drag cup and cause the indicator to
>read high. It
>can also physically hit the drag cup and make it move as well.
>
>Let us know what you find inside yours!!!
>
>-Tony
>
>
>Message text written by INTERNET:triumphs-owner@autox.team.net
> >Date: Sat, 16 Oct 1999 13:10:04 -0400
>From: "Tep735" <Tep735@email.msn.com>
>Subject: Spit tachometer calibration?
>
>
>How can you calibrate the tachometer on a 79 Spitfire? My tach is showing
>twice as high as it should at idle.
>
>Frank -Tep735@msn.com
>79 Spitfire
><
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