[Vwdiesel] Tach

[Chuck Carnohan]

Does this mean that if one had the know-how (Roger) that a transducer or
the like could translate the W terminal pulse to make a gas tach work?

Chuck Carnohan


-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]
On Behalf Of Roger Brown
Sent: Wednesday, September 21, 2005 9:57 AM
To: vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] Tach

HWY9FERGS at cs.com wrote:
> I thought the W terminal was there to mimic the ignition signals.  If
not, do 
> you know what their intended purpose was?   Ferg

Yes, it is used for the disel tachs and upshift lights.  It does put out
a signal whose frequency varies with RPM.  However, as 
I noted earlier, that frequency is about 12 times higher than an
ignition signal would be due to the source of the signal.  If 
you connect that to a "gas" tach as some have tried, you end up with it
reading something like 5000 RPM at idle and the the tach 
is pegged at full scale as soon as you rev the engine.

-- 
    Roger

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