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Well I do know one thing and that is the copper coil that the circuit goes through before affecting the tach is very much responsible for controlling the current. The copper coil itself is a resistor and I believe that if the copper coil is different for the 6cyl and 4cyl then its just a simple trip to the dealership to get the coil and replacing it. Im still researching to see if there are any other major differences between the two tach. I am going to have them pull up the schematics of both tach and differentiate between them.