[Vwdiesel] Diesel Tachometer in an older VW
r.c.brown at ieee.org
Sun Aug 24 12:44:02 PDT 2008
Yep, a gas tach will read out much higher when hooked to a W-termianl signal:
Tony and Lillie wrote:
> OK, Thanks Loren and Kurt.
> Now I'm begining to understand. I used the complete instrument cluster from the gasser 2.0 90 4-cylinder. So, it's not just a plug and play thing. I guess I was under the impression it was that simple. DOH!!
> I also have to figure out how to drive the electric speedo, but that's not as big of a deal at this time. Just one thing at a time.
> ----- Original Message -----
> Subject: Re: Diesel Tachometer in an older VW
> Well, a gas tach gets 2 pulses (for a four cylinder) per crank
> revolution. An alternator is putting out however many pulses
> (number of windings or maybe a multiple of the number of
> windings) per revolution but it's turning at 2 to 5 times faster
> than the crank! The newer it is the faster they tend to turn
> them for more amperage.
> There ARE workarounds. I just don't know them. I know Jake
> Russel built one. There's a dab of circuitry and a pot to adjust
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