I've seen old optical tachometers that were passive (needing external
light).
Many of the new ones use in infrared beam.
-Phil
----- Original Message -----
From: "Bob Bruce" <bobbruce@mts.net>
To: "Peugeot List" <peugeot-L@yahoogroups.com>
Sent: Monday, February 28, 2005 12:42 PM
Subject: [Peugeot-L] Hand Held Diesel Tach Question
>
> I came into a hand held diesel tach that the dealers used to use
> to setup the Peugeot diesel engines.
> I required a white stripe on the crank pulley and then this contraptions
> lens
> was pointed at it and it would read the RPM on a scale.
>
> So the question is
>
> Do these things have a bulb in the wand that shines onto the stripe or do
> they just
> pickup the reflection of the room light off the stripe?
>
> Bob
>
> [Non-text portions of this message have been removed]
>
>
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Received on Mon Feb 28 12:48:49 2005
