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Re: TR3 Speedometer & Tach

To: triumphs@autox.team.net
Subject: Re: TR3 Speedometer & Tach
From: "Mike Kitchener" <mikek@wanadoo.fr>
Date: Wed, 9 Jan 2002 15:02:57 +0100
Listers ,
I'm curious.....Does anyone know the logic in the BA thread system??
Example :  25 BA         major dia. .0098"  363 tpi

Thanks

Mike
> >I just double-checked a TR3 ammeter, and a flat-glass TR4 oil gauge,
> they are definitely not quite 36 tpi.  I still believe they are 3 BA
> (which my chart gives as .1614" major diameter, 34.8 tpi). <
> 
> Which works out to be .729 mm pitch.

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