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Do OBDII gauges on an old cellphone (or iPod)?
Just need a Bluetooth or WiFi OBD dingus, an instrument app, and a mobile device to run it on.
There's lots to choose from.
Decide on a mobile device first, because it may affect your decision on the other two bits.
In particular, Apple doesn't do Bluetooth (a$$hat$).
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Warning: May contain traces of nuts.
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