HEI with factory tach
May 18th, 2012, 03:27 PM
#1
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Join Date: Feb 2012
Location: Texas
Posts: 29
HEI with factory tach
Greetings. I have a '72 H/O with a GM HEI and was wondering if there are any wiring modifications to hook it up with a factory tach? Can i connect the tach lead strait to the "tach" terminal on the distributor? Thanks.
Bruce
Bruce
May 18th, 2012, 09:32 PM
#3
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Join Date: Dec 2008
Location: Scottsdale, AZ
Posts: 608
x2 I did the same thing on my `72 LeMans. I added a factory repro. tach while I still had points. I converted to HEI with no issues, other than the tach itself reading slightly (50-100rpm) high. I doubt the ignition is to blame. To paraphrase a quote from a wise man here (J-Chicago), GM gauges are hardly precision measuring devices. 
-Henry
-Henry
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