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Porsche Non-US 911 76-89 Odometer Gear ( view PDF instructions ) There are multiple tooth count options that can and will be installed in this odometer. You will need to count the teeth on the old gear before ordering. The outside gear will have 20 teeth and the smaller inner gear between 21 and 32. {If you cannot count the teeth on the main gear then count the teeth of the next gear that it meshes with. If your tooth count is 49: 20x21, 48: 20x22, 47: 20x23, 41: 20x29, 40: 20x30, 38: 20x32} $25.00 Select a style: 20 x 21 20 x 22 20 x 23 20 x 29 20 x 30 20 x 32