The tach can be wrong for two reasons: Either there is too much noise on
the ignition circuit causing the tach to mis-trigger, or the capacitors
and regulation circuit inside the tach have expired and together make
the tach both incorrect and temperature sensitive. The latter is much
more common with stock wiring while the former can occur (but it doesn't
always) with Pertronix modules.
You can get the tach rebuilt with OEM guts by a place such as
Nissonger's or you can get the module I build installed by Tom Hall or
myself. The module we install can be driven directly by MSD ignition
controllers and works properly with Pertronix modules as well, so if you
are thinking of going this route then that may be an advantage.
Cheers,
theo
> -----Original Message-----
> From: tigers-bounces@autox.team.net
> [mailto:tigers-bounces@autox.team.net] On Behalf Of sralsten@ca.rr.com
> Sent: December 22, 2008 9:06 AM
> To: Tigers@autox.team.net
> Subject: [Tigers] Gauge accuracy issues
>
> The post on speedo cable got me to thinking about this.
>
> Both my tach and speedo function, but both report wrong. Tach
> is clearly too high while speedo is clearly too low. Both are
> proper Jaeger instruments. The tach is regularly 1k to 1.5k
> too high. The speedo will report anywhere from 45mph to 55
> mph when actual speed is in the 65mph area. Interesting also
> that the odometer is correct even though the speedo is wrong.
>
> Fixing this is not very high on my priority list but was
> interested in suggestions.
> The odometer being correct would indicate that the speedo
> cable is probably correct right ? Is this just a gauge
> calibration issue ?
>
> Thanks
>
> Steve R
> B9473720
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