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**The Rocknrod** · 08-03-2020, 12:28 PM

You may have a problem with some tachs. There is an explanation here, not to difficult to overcome - https://www.americanautowire.com/vie...c-distributor/
Once you read that, here is a part (depending on your tach) - https://www.glowshiftdirect.com/hei-...signal-filter/

08-03-2020, 12:28 PM	#3
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Tach with an HEI Distributor for a 66? You may have a problem with some tachs. There is an explanation here, not to difficult to overcome - https://www.americanautowire.com/vie...c-distributor/ Once you read that, here is a part (depending on your tach) - https://www.glowshiftdirect.com/hei-...signal-filter/ __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? Last edited by The Rocknrod; 08-03-2020 at 12:43 PM.