Review of Cheap Ebay GPS Speedometer

str12-340 said

clean the case - there are numbers that correspond with the number of teeth on the speedometer gear - They are in groups, easy peasy

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^^The Chrysler system is much better that way than Ford/ GM. The reason for that is the size change of the gears. You can only change so much with a GM/ Ford or you have to tear down the trans and change the gear pressed onto the mainshaft.