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doug axelrod Doug as far as the A/F ratio thats covered. What you want is a Knock sensor readout. If you look at a LS1 chevy motor you will see they have 2 sensors 1 front and 1 rear under the intake they produce an AC voltage went the motor is knocking and the computor retards the timing until it gets to a certain value and then starts adding again timing. It also reads when the EGR valve is working and how much flow is involved. You can get a Knock sensor kit from Jeg's or Summit. I don't think they have a output for a print out. I am not sure. Hope this helps. I will find the article on this, this in an tech series in Hot Rod done years ago. My basic answer is right but the rest may be a little off. Rick Lake
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