I tried using the E67 pcm output on my DD guages but the speed was wrong. I know all of the correct parimeters were input the first time. I ended up using the procedure in the installation maunual for the gauges to "adjust or compensate" for the difference that is listed in the instructions. I used my garmin GPS as the correct speed # and drove and hit the buttons until it read correctly. Was kind of a pain to do while driving but after everything was said and done it works correctly.
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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