I was on a 1,000+ mile trip last week. During each leg, the ScanGauge would lock up. The only way to reset it was to physically disconnect it and reconnect it, which screws up any stored data. As far as I can tell, ScanGauge II is worthless as a trip computer over any period. It works as real time gage until it locks up, and it works as a code scanner.
Unfortunately, I won't be returning it because it was stolen out of my car during the trip. I am debating whether or not to buy another one or buy a better scanner that doesn't pretend to be a trip computer that it's not.
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