Make sure that you have ODO mode in the tripmeter before starting the process. This wont work if you have either of the two trip meters at display. Also, in the final step keep the set button pressed for ~ 5 sec.
The reason it took many tries for you might be because you did not have the "ODO" mode at display.


However im not sure how reliable the little LED dimmer controller is. Having a knowledge of the circuit diagrams before doing anything is of great importance.




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