OBD II scanner/reader

SouthArk370Z

For your stated purposes, speed is not critical and any Bluetooth/Wi-Fi lag wouldn't be important.

I use a ScanGuageII (plugs straight into the OBD port) for reading/clearing DTCs and real-time monitoring of speed, water temp, IAT and one more param depending on what I am interested in at the time. For logging, I bought an ELM-based OBD-to-USB adapter that I connect to a laptop. I can also read/clear DTCs with the software but it's easier to use the ScanGuage.

The ScanGuage runs about $160 dollars, so that may not be the best option for you. The OBD-to-USB adapter was $20-30, I already had the laptop laying around, and I downloaded the software for free.

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