Re: Tachometer not playing ball - TMD22


My tach on my Perkins showed similiar behavior and I traced it back to a corroded connector on the alternator that goes back to the tach. Check the sensor voltage on the back of the tach when the engine is running. I believe the voltage for the tach sensor on my perkins was around 6 or 8 volts when working properly. I cleaned the alternator spades and replaced the female connector and all is well now. 

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