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Question for you folks, I am using a factory ecu to run my swap. It's out of a 2000 silverado. I'm wondering what I need to do so I can run my stock in dash 1971 tach. I have two options in my tuning software for 4 cylinder tach output, and one for 8 cylinder tach output. I believe I read a while back to use 4 cylinder, but I can't find where I read that. Can anyone confirm?
 
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