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Date:   Sun, 1 May 2011 10:36:30 -0600
Reply-To:   ralph meyermann <ralphmeyermann@GMAIL.COM>
Sender:   Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:   ralph meyermann <ralphmeyermann@GMAIL.COM>
Subject:   Re: Which tachometer? 400-1300Hz or 800-2400Hz
Comments:   To: Rocket J Squirrel <camping.elliott@gmail.com>
In-Reply-To:   <BANLkTi=s9bH7hn-pNuooYS8FyTCeoXL42Q@mail.gmail.com>
Content-Type:   text/plain; charset=windows-1252

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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