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Old April 1st 2013, 22:49
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Humble Humble is offline
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Join Date: Jan 2003
Location: Boulder Creek, CA
Posts: 758
It depends on the dash, some can use external sensors, and some only poll the ecu over serial/can bus. Typically, logging capable dashes will take external sensors, or have an additional box that does. Either way, a logger is nice to have regardless of setup, but usually adds 50% to the cost.
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