It may be that if connecting one of these tachs in a diesel, it uses
"W" from alternator.   .......

Maybe:  http://www.vwdiesel.net/forum/index.php?topic=22185.0

If so, difference in hertz maybe a non issue?

Neil.

On Sun, May 1, 2011 at 8:59 AM, Rocket J Squirrel
<camping.elliott@gmail.com> wrote:

> For use on 4,5,6,8 cylinder application engines with standard
> coil ignitions, most square wave electronic control ignitions
> with tachometer output terminal, and alternators with "w"
> tachometer terminal.
>
> Eguauges does not know what difference there is between them. After some
> searching, I found this:
>
> 333 365 is 4,000 RPM (400�1300Hz)*
> 333 369 is 4,000 RPM (800�2400Hz)*
>
> where * = For Alternator use only
>
> Can someone help me figure out which gauge will read correctly when
> connected to the coil? Maybe they both will, but this difference of 2:1
> in the frequency spec gives me pause.

-- 
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines