Date: Sun, 1 May 2011 13:29:47 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Which tachometer? 400-1300Hz or 800-2400Hz
Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=original
Ignore the alternator information.
what you want is a tach that works on 12 volts, negative ground, for a 4
cylinder engine.
and you run that with a wire from your terminal '1' on your coil. ( the
'tach signal' part ) .
you can run a very small tach like that if you want..
but usually tachs are bigger than what you'd have for a say, oil pressure
gauge.
Just easier to see at a glance.
I'm looking at my tach a lot ...kinda 'drive by it' most of the time.
if you can find a whole instrument cluster with tach, for an 84 or 85 ..
that'll go in pretty easily ..and give you a digital clock and a nice big
tach.
The rare 84 Wolfsburg tack has an all black face..
the 85 and up ones have a nice green band, then an orange band, then
redline.
Makes a really nice looking tach in any gas vanagon that didn't have one.
( 86 and later instrument clusters can be installed to, but it's more
involved. The 84 or 85 is pretty much a bolt-in....might have to rearrange
some wires at T14 the instrument cluster plug ..but that's not hard to do )
Scott
www.turbovans.com
----- Original Message -----
From: "Rocket J Squirrel" <camping.elliott@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, May 01, 2011 10:47 AM
Subject: Re: Which tachometer? 400-1300Hz or 800-2400Hz
>I don't think so.
>
> My guess is that one reads twice as high rpm than the other when
> presented with a signal. Whether this applies to the coil signal is
> unknown to me.
>
> On Sun, 2011-05-01 at 10:36 -0600, ralph meyermann wrote:
>
>> Hmm that's a good question. Could it be possible that the higher hz is
>> faster react time like the newer tv's ? I don't know im just guessing
>> cause i've seen tachometers that respond fast and some slow?
>>
>>
>> > On May 1, 2011 11:06 AM, "Rocket J Squirrel"
>> > <camping.elliott@gmail.com> wrote:
>> >
>> > I've settled on the VDO "Cockpit Black" series of meters for Mellow
>> > Yellow's upcoming gauging project.
>> >
>> > Looking at eguages's offerings in the 2-1/6'' diameter size, 4000
>> > rpm
>> > range, I find two very similar gauges.
>> >
>> > One is the 333 365, the other is the 333 369. They have very similar
>> > prices and seemingly the exact same specifications:
>> >
>> > 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.
>> >
>> > --
>> > Rocky J Squirrel
>> > '84 Westfalia: Mellow Yellow ("The Electrical Banana")
>> > '74 Westrailia: (Ladybug Trailer company, San Juan Capistrano,
>> > Calif.)
>> > Bend, OR
>> > KG6RCR
>>
>>
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