Check to see if it is in rpm mode. If not, it will not display them. I can't believe your dealer did not run you thru the directions after bringing it in once. Read the directions from perfect pass. They are available on their website if you did not get them from your dealer. you Access the rpm mode using the menu button. If you have done that and the rpm mode is showing but you have no numbers reading, then the wire is not hooked up to the tach wire. If it is, something is wrong with the computer or the display. Make sure all the wires going into the computer box are tightly connected.
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