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Date:         Sun, 1 May 2011 22:16:36 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Which tachometer? 400-1300Hz or 800-2400Hz
Comments: To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
In-Reply-To:  <0d8e01cc083e$86e0dd60$6401a8c0@PROSPERITY>
Content-Type: text/plain; charset="utf-8"

Many aftermarket tachs will not work with the Vanagon ignition system. The variable dwell messes them up.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Scott Daniel - Turbovans Sent: Sunday, May 01, 2011 4:30 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: Which tachometer? 400-1300Hz or 800-2400Hz

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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