If possible, you might try setting the meter somewhere you can see it from
the driver's seat and then rev the engine to a few different values and
compare the readings to see if there is a consistency in the mismatch,
either a percentage or a constant difference.
Eddie
1971 Midget
----- Original Message -----
From: "dennis" <mg-dennis@mindspring.com>
To: "'MG Mail list'" <mgs@autox.team.net>
Sent: Tuesday, January 16, 2001 11:46 AM
Subject: Tach
> When setting my idle I have never been able to get it under 1100 rpm. I
> can get it down to about 1000 but it would wants to die. This weekend
> I went down to Sears and bought one of their $30 dwell/tach meters. It
> says I'm idling at 800 when my tach says 1100. I am more inclined to
> believe the meter rather than my 34 year old tach. Is it typical to see
> that much discrepancy in a tach? If it is in error is it a percentage
> of it's reading or is it just 300 rpm fast no mater what rpm I'm at?
>
> Dennis
> 67 MGB
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