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Since the needle displacement exerts a fundamental influence in the operation of a Common Rail Diesel injection equipment, an accurate measurement of the instantaneous position of the control piston is crucial for a more thorough analysis of the behavior of the injectors, in particular when multiple injections are employed. Moreover, the development of a cheap instrumentation would allow to enlarge the Diesel engine on-board equipment with an instrumentation for the diagnosis of the injector operation. Eddy current sensors have been traditionally used in lab activities to measure the position of the needle inside the injector; apart from its high cost, the scientific literature clearly shows their inadequacy, given the presence of electromagnetic disturbance: the current pulse which controls the opening of the injector nozzles generates electromagnetic fields which strongly affect the acquisition of data.