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Huck · 11-03-2006, 09:48 PM

the HEI system uses a different wave length of signal that the tach picks up. The original tach's were far from accurate running off the stock distributor and when hooked up to an HEI dist, they are off a bit more but--I too am running an aftermarket reproduction of the original on my 350 with HEI and have had no problems.

11-03-2006, 09:48 PM	#5
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,261	Re: Is Original tach compatible with HEI ?? the HEI system uses a different wave length of signal that the tach picks up. The original tach's were far from accurate running off the stock distributor and when hooked up to an HEI dist, they are off a bit more but--I too am running an aftermarket reproduction of the original on my 350 with HEI and have had no problems.