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The first run of SCT's iTSX also includes a few gauge-display options that can present any OBD-II system data that the device processes. Among those displays are three different numeric displays, or a single dial-style sweeping gauge (a digital numerical display is incorporated above the sweeper). Each gauge style also includes low- and high-side limits that will set off a red warning flash whenever either limit is reached. We configured the gauge to monitor spark (timing) while testing the SCT tune in Marty's Shelby.