[Mgs] Mgs Digest, Vol 195, Issue 1

[dave northrup]

From Wikipedia

A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft<https://en.wikipedia.org/wiki/Axle> or disk, as in a motor or other machine.[1]<https://en.wikipedia.org/wiki/Tachometer#cite_note-1> The device usually displays the revolutions per minute<https://en.wikipedia.org/wiki/Revolutions_per_minute> (RPM) on a calibrated analogue dial, but digital displays are increasingly common.

The word comes from Greek<https://en.wikipedia.org/wiki/Greek_language> τάχος (táchos "speed") and μέτρον (métron "measure"). Essentially the words tachometer and speedometer<https://en.wikipedia.org/wiki/Speedometer> 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.

From dictionary.com
tachometer
[ ta-kom-i-ter, tuh- ]SHOW IPA
[cid:image001.png at 01D9C51B.79A781B0]
________________________________
noun

  1.  any of various instruments for measuring or indicating velocity or speed, as of a machine, a river, or the blood.
  2.  an instrument measuring revolutions per minute, as of an engine.


From: Mgs <mgs-bounces at autox.team.net> On Behalf Of PaulHunt73
Sent: Wednesday, August 2, 2023 2:06 AM
To: mgs at autox.team.net
Subject: Re: [Mgs] Mgs Digest, Vol 195, Issue 1


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.

PaulH.
On 01/08/2023 19:10, Eric Russell wrote:
I believe a tach (short for tachometer) and rev counter refer to the same instrument.

And, yes, all MGAs came with a tach as original equipment.

EjR

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