#12DG2-S. These gears are used with most Jeep and Dodge truck electronic speed sensors for the speedometer. You can increase or decrease the number of teeth depending on tire size to make your speedometer more accurate.ONce you cahnge gears the sensor needs to be indexed according to the new tooth count. The drive gear has 13 teeth and is machined into the output shaft. These are the late model type with a short shaft. Comes in 26 tooth to 43 tooth.
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