My tach works fine until about 5000 RPM then it gets all squirly(technical term). I can tell that the engine is revving higher, but the tach just bounces around.....Any suggestions?

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<A HREF="http://www.stratagaz.com/69LM1/1969LM1Convertible.htm" TARGET=_blank>My 69 LM1 Convertible
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probably that 'rare' ...388 block of yours Paul, http://www.camaros.net/forum/smile.gif

click

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69RS 350/255 LM1, Balanced, TRW forged pistons, .30 over, TH-350 auto.,
Dover White,Blue Vinyl top, F&R spoilers,pdb, close ratio ps,am/fm,3.08 Posi., A/C, fold down rear seat
My RS www.brainerd.net/~knudsen/69RS (http://www.brainerd.net/~knudsen/69RS)

LOL click!!

The rare 388 block is in a crate, this is the new 383 motor....

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<A HREF="http://www.stratagaz.com/69LM1/1969LM1Convertible.htm" TARGET=_blank>My 69 LM1 Convertible
</A>

Maybe a little spark scatter causing the tach to act up?

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...Dennis
"The '69 (http://chevelles.com/showroom/ww.jpg), the '96 (http://www.camaroslimited.com/graphics/memcars/96ss.jpg) our local club (http://camaroslimited.com/)"
and the "daily driver" (http://chevelles.com/showroom/DjD/dsc00016.jpg)

"Spark Scatter"?? I've never heard that term before.

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<A HREF="http://www.stratagaz.com/69LM1/1969LM1Convertible.htm" TARGET=_blank>My 69 LM1 Convertible
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He's referring to the secondary (high) voltage from the coil leaking into the primary side. If you're using an external coil take a points type condensor and hook the lead up to the positive side of the coil and ground the condensor housing. There are also tach filters available.

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'69 RS Camaro
355 5-speed 4.11

Thanks for the explanation.....I'm a little slow, but I eventually catch on!

I am running a large body HEI with the coil in the cap.

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<A HREF="http://www.stratagaz.com/69LM1/1969LM1Convertible.htm" TARGET=_blank>My 69 LM1 Convertible
</A>