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I am using a generic (read inexpensive) eBay ELM-327 BT unit with the free version of the Torque App on my Android head unit. Using it to bring up 6 dial gauges:
* Coolant temp
* Oil temp
* Throttle position
* Engine speed
* Instant MPG
* Ambient temp
The list of available values appears when adding a new display element - no PID codes required.
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