Which gauge shows your current speed in miles per hour?

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The speedometer is the gauge that shows your current speed in miles per hour. It measures how fast the vehicle is moving by tracking wheel rotation and converts that into a reading you can read at a glance, typically in mph in the United States. The odometer instead tracks total distance traveled (or trip distance if you use a resettable trip odometer), the fuel gauge shows how much fuel remains, and the tachometer indicates engine speed in revolutions per minute. So for knowing how fast you’re going right now, the speedometer is the one to read.