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I've used both in the Corolla & prefer the Ultragauge. It fit's nicely above the steering column w/o really blocking gauges. Not sure if your Matrix has a similar cluster?
Also like the adjustable alarms of the Ultragauge & the ability to better fine tune the MPG calibration. The Scangauge needs to run through a few tanks to dial in the calibration where the UG will let you fine tune after 50 miles into a tank.
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