Stainless Steel-Indexing plungers GN 817.6 with sensor for position monitoring allow for electronic monitoring of the plunger pin state. For this purpose, a magnet is integrated into the plunger pin that switches the sensor upon engaging after approx. 2/3 of the locking distance l1. The sensor electronics then outputs a high signal, e.g. to a machine control, and additionally indicates this switch state with an LED on the sensor.