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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#202122">From Wikipedia<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#202122">A <b>tachometer</b> (<b>revolution-counter</b>, <b>tach</b>, <b>rev-counter</b>, <b>RPM gauge</b>) is an instrument measuring the rotation speed of a <a href="https://en.wikipedia.org/wiki/Axle" title="Axle"><span style="color:#3366CC;text-decoration:none">shaft</span></a> or
disk, as in a motor or other machine.</span><sup id="cite_ref-1"><span style="font-size:8.5pt;font-family:"Arial",sans-serif;color:#202122"><a href="https://en.wikipedia.org/wiki/Tachometer#cite_note-1"><span style="color:#3366CC;text-decoration:none">[1]</span></a></span></sup><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#202122"> The
device usually displays the <a href="https://en.wikipedia.org/wiki/Revolutions_per_minute" title="Revolutions per minute"><span style="color:#3366CC;text-decoration:none">revolutions per minute</span></a> (RPM) on a calibrated analogue dial, but digital displays
are increasingly common.</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#202122"><o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#202122">The word comes from <a href="https://en.wikipedia.org/wiki/Greek_language" title="Greek language"><span style="color:#3366CC;text-decoration:none">Greek</span></a> τάχος (<i>táchos</i> "speed")
and μέτρον (<i>métron</i> "measure"). Essentially the words tachometer and <a href="https://en.wikipedia.org/wiki/Speedometer" title="Speedometer"><span style="color:#3366CC;text-decoration:none">speedometer</span></a> have identical meaning: a device that
measures speed. It is by arbitrary convention that in the automotive world one is used for engine revolutions and the other for vehicle speed. In formal engineering nomenclature, more precise terms are used to distinguish the two.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">From dictionary.com<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:36.0pt;font-family:"Arial",sans-serif">tachometer<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Arial",sans-serif">[ ta-<b>kom</b>-i-ter, t<i>uh</i>- ]</span><span style="font-family:"Arial",sans-serif">SHOW IPA<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:15.0pt"><i><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black">noun</span></i><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo1"><span style="font-size:13.5pt;font-family:"Arial",sans-serif">any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood.<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo1"><span style="font-size:13.5pt;font-family:"Arial",sans-serif">an instrument measuring revolutions per minute, as of an engine.<o:p></o:p></span></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Mgs <mgs-bounces@autox.team.net> <b>On Behalf Of
</b>PaulHunt73<br>
<b>Sent:</b> Wednesday, August 2, 2023 2:06 AM<br>
<b>To:</b> mgs@autox.team.net<br>
<b>Subject:</b> Re: [Mgs] Mgs Digest, Vol 195, Issue 1<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>A rev counter is a mechanical device driven by a cable from the block. A tachometer is an electronic device driven by electrical pulses from the coil. They are completely different.<o:p></o:p></p>
<p>PaulH.<o:p></o:p></p>
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<p class="MsoNormal">On 01/08/2023 19:10, Eric Russell wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:18.0pt">I believe a tach (short for tachometer) and rev counter refer to the same instrument. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt">And, yes, all MGAs came with a tach as original equipment.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:18.0pt">EjR <o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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