My nissan cefiro rpm gauge is faulty, sometimes it display the correct rpm, but most of the time it erupts to an 8 rpm (max rpm). Also, a slight revolution of the gas pedal would make the rpm gauge extatic, making it jump from numbers to numbers. I tried bringing this to the Casa, and the part itself is 15k+ (rpm gauge only). Do you think that the fault could be otherelse, and I could save that 15k and turn it to 1500 of fixing?