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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
 
Join Date: Jun 2008
Location: Detroit
Posts: 898
I have found the megasquirt site has accurate hei info. The tach output from the hei 7 and 8 pin modules is a 12v square wave. I have been using it directly to my tach for years. What hei module do you have? Do you have 4, 7, or 8 pin? Also, do you have anything tee'd into the tach?
Old 10-16-2009, 10:41 AM
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