Re: [OMC-Boats] Dwell/tach

From: Justin DeSantis <duc1098desmo@...>
Date: Fri, 11 Sep 2009 22:00:29 -0400

Cool, I'm looking forward to hooking it up and comparing it's accuracy
to my other 2 tachs. Hopefully it's correct. You just clipping it on
to the outside of the plug wire like a modern tach, or does it require
some special hook-up procedure. One more question where is the port to
inspect timing? (I ordered a service manual. Not here yet.)

On Fri, Sep 11, 2009 at 8:47 PM, Lee Shuster <lks@...> wrote:
> I've got one of those old-school RAC's too. Pretty common back in the
> sixties.
> Simple to hook it:
> 1) You connect the Red side to the (-) coil primary (same terminal which has
> the lead to your distributor points.
> 2) Then the other side is connected to a good engine ground.
> Should have a switch to change from 6 to 8 cyl. (4 cyl used 1/2 the 8 cyl
> reading).
> On Sep 11, 2009, at 5:45 PM, Justin DeSantis wrote:
>> Hey gang. I borrowed a dwell meter and tach combo from a friend. I
>> can't for the life of me figure out how to use it as a tach though.
>> It's an old RAC dwell/tach. all it has is red and black alligator
>> clips. Other tachs I've used just go to the spark plug cable, one
>> wire. How does this thing hook up for use as a tach? One lead to the
>> spark plug, one to the battery negative? I know how to use it as
>> dwell, but not as tach. Anyone use one of these old beasts?
>> _______________________________________________
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Received on Friday, 11 September 2009

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