Scan Gauge
Take a lok at the SCAN GAUGE this is a wonderful device for towing,, It is about 2x5x2 and has a cord that plugs into the ODBII ( diagnostic port usually under the dash on the drivers side. It will report a host of information on the condition of the engine and transmission as well as mileage info. It is a great tool, relatively inexpensive and simple to install just stick on velcro , plug it in and your done.
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