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**FirstOwner69** · 05-18-2017, 04:55 PM

I've been running a factory 8 cylinder tach with a GM HEI distributor and no filter for 800 miles without any problems. It reads about 2900 RPMs at 60 MPH if I recall correctly. I have a 4.10 axle.

05-18-2017, 04:55 PM	#9
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: HEI to factory Tac reads tooo Hi I've been running a factory 8 cylinder tach with a GM HEI distributor and no filter for 800 miles without any problems. It reads about 2900 RPMs at 60 MPH if I recall correctly. I have a 4.10 axle.