On the Scangauge E, there are three screens on which you can customize the gauges by pressing the buttons on the right, next to the gauges. Keep pressing until you see TPS. To cycle between the screens, use the buttons on the left.
Refer to the user manual, it has an easy to understand picture which explains the screens and the custom gauges. Good luck.
Btw, what Mazda do you have?
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